The science of (mostly) human sex

‘Satyress with a Putto’ by Giovanni Battista Tiepolo

It’s hard to believe the results of a questionnaire in which 34% of the respondents say they’ve had sex with animals. This study was done in Brazil, which leads one to wonder how much they have in common with Colombia, where it’s not uncommon for men to have had sex with donkeys (if this Vice video is to be believed — WARNING: man-on-donkey action in the last two minutes of the linked video).

Why does semen glow in the dark?” And could that trait somehow be used to stop sperm theft? “Mr. Pressil’s former girlfriend and domestic partner, Ms. Anetria Burnett, supposedly secreted Mr. Pressil’s used condoms to a fertility clinic, which then used Mr. Pressil’s sperm to inseminate Ms. Burnett.  Ms. Burnett subsequently gave birth to twins. Mr. Pressil took a DNA test that proved he was the father and then began paying child support of $800 per month.”

“Female ejaculation and squirting/gushing are two different phenomena. The organs and the mechanisms that produce them are bona fide different. The real female ejaculation is the release of a very scanty, thick, and whitish fluid from the female prostate, while the squirting is the expulsion of a diluted fluid from the urinary bladder.”

Controversial in that the thesis of [The Technology of Orgasm] has been almost universally accepted and embraced by the mainstream press and the sex toy industry, while at the same time being quite seriously critiqued by historians of sexuality. In her book Maines contends that the vibrator was regularly used by doctors to treat “hysteria” which they had previously been treating by manually stimulating women to orgasm.”

From the new movie “Hysteria” (based on Maines’ theory)

“In two experiments, we showed that memory in women is sensitive to male voice pitch, a sexually dimorphic cue important for mate choice because it not only serves as an indicator of genetic quality, but may also signal behavioural traits undesirable in a long-term partner.”

“John L. Locke … argues that men and women have radically different ways of speaking … because they have radically different evolutionary needs. Men, he argues, use antagonistic speech, or “duels,” to show off their strength and prove themselves to women. Women, meanwhile, use quieter speech patterns to bond with each other.

“Even girls who are having a one-night-stand want to cuddle and kiss and become anxious about what their male partner is thinking of them, or whether they still find them attractive. On the other hand, the interviewed men largely declared that they usually wanted to eat, urinate or sleep after sex.” Here’s a pdf of the cited paper, “Variation in Reproductive Strategies Influences Post-Coital Experiences With Partners”.

“”When a woman has an orgasm,” he explains, “the pH of her reproductive tract shifts in a way that favors sperm that enter her at that point.” Why is this so important? Sperm competition. In prehistoric times, according to Ryan, women had “multiple lovers at any given ovulatory cycle, even in any given sexual event”.

“[Terri Conley] disagrees with the various forms of scientific evidence indicating that men have a stronger, biologically-evolved sex drive than women. Her alternative explanation …  is that both men and women are motivated by an equally strong interest in the physical pleasures of sex. It is just that men anticipate that casual sex will usually be pleasurable, while women do not anticipate that casual sex will be physically pleasurable unless a number of conditions are met.” A critique.

“Studies have confirmed that women are overwhelmingly more likely to cheat on their partner during the two or three days of ovulation. … Here’s the rub: The idea of what constitutes “the best man” also changes during that time. The good news is that you’re pretty safe for about 27 days of most months. To be fair, if her body chemistry is artificially altered by birth control pills, this instinct may be tempered.

“In lab studies, women who are in fertile stages of their cycle are more likely to go for men who look healthy, self-confident, and masculine, which tend to be markers for good genes, but also for infidelity. … Women on the pill do indeed select men who look like they will be more reliable and steady. But outside the lab …. the team found that women who had met their partners while on the pill reported less sexual satisfaction but greater general satisfaction than women who had been off the pill. In other words, their partners were good fathers and good providers, but not necessarily on fire between the sheets.”

“Swami et al (2007) looked at WHR [waist-to-hip ratio] preferences among males in Spain, Portugal, and the UK.In all three countries BMI, not WHR, accounted for the most variance in perceived attractiveness. … This paper also has a great summary of methodological issues with prior WHR studies (e.g., the use of two dimensional line drawing, failing to control for BMI). Cornelissen et al (2009) looked at patterns of British male gaze fixation during attractiveness judgments of pictures of women. Men tended to look at the upper abdomen and face, not the hip or pelvic area.”

Sophia

“Each additional sexual partner increased the odds of infidelity by 7% while increasing years of education seem to decrease the risk by 10%. Very roughly speaking each addition partner negates the benefit of a year of education with regard to infidelity risk.

“Paternal grandmothers will therefore share more genes overall with granddaughters than with grandsons (the authors calculate an overall genetic relatedness of 31% with granddaughters but only 23% with grandsons). … The results of this study matched the predictions beautifully. In all seven populations grandsons survived better in the presence of maternal rather than paternal grandmothers (p = 0.0081) while granddaughters survived better in six of the seven populations when they received assistance from paternal instead of maternal grandmothers (p = 0.0046).”

“A kiss puts two people in very close proximity. Our sense of smell allows us to pick up subconscious clues about the other person’s DNA or reproductive status. Biologist Claus Wedekind found that women are most attracted to the scent of men who have a very different genetic code for their immune system in a region of DNA known as the major histocompatibility complex. Pairing off with a male who has a different set of genes for immunity can lead to children that will have a higher level of genetic diversity, making them healthier and more likely to survive.

We investigated salivary testosterone levels in men watching (n = 26) versus participating (n = 18) in sexual activity at a large U.S. sex club. Subjects averaged 40 years of age and participated between 11:00 pm and 2:10 am. Consistent with expectations, results revealed that testosterone levels increased 36% among men during a visit to the sex club, with the magnitude of testosterone change significantly greater among participants (72%) compared with observers (11%). Contrary to expectation, men’s testosterone changes were unrelated to their age.”

“Both men and women become more religious when seeing same sex competitors. We discuss several possible explanations for these effects. Most broadly, the findings contribute to an emerging literature on how cultural phenomena such as religiosity respond to ecological cues in potentially functional ways.”

“Assuming that these studies are correct (more on that in a minute), and that sex is good for your health, then the obvious next question would be, how should you arrange your sex life so as to maximize the health benefits?

“According to a case report from cardiologists Yarlioglues et al, a married couple deliberately ate some mad honey “for reasons of sexual performance”. … The toxin in mad honey is gryanotoxin. It acts by potentiating the opening of sodium channels, which are found both in the heart and the brain. This may be why it produces a combination of cardiovascular and psychoactive effects.”

Dancer Lisbeth Gruwez, choreographer Jan Fabre:

A catch-all catch-up post

Gina Lolabrigida

In the earliest records of human religion, castration was regarded as an act of devotion. Moreover, the ritual of circumcision is still followed by many modern religions. … CONCLUSION: The ritual of castration evolved into circumcision as a less-invasive and bloody procedure than castration.

Tally is short for Tallywacker, a British nickname for penis. It is also the nom de Internet of a 55-year-old, heterosexual, happily married attorney in Tennessee who is at the vanguard of the foreskin restoration movement. With evangelical zest, he shares his story, and a sequential series of photographs of his penis.

According to the original commitment–skepticism hypothesis, women err on the side of underestimating prospective mates’ commitment to avoid the high costs of pregnancy without support. … Confirming our predictions, … postmenopausal women did not show a bias toward underinferring men’s commitment intentions.

“The current study demonstrates that exposure to a sexily dressed woman increases single men’s likelihood of noticing status products in a visual display.” (pdf)

[We used] one of the most compelling visual cues of female sexual attractiveness (low waist-to-hip ratio) to test the influence of news anchor sexualization on audience evaluations of her as a professional and their memory for the news that she presents. Male participants saw the sexualized version of the anchor as less suited for war and political reporting. They also encoded less news information presented by the sexualized than her unsexualized version.

Marisa Berenson

Previous research had shown that a woman at the fertile stage of her menstrual cycle seems more attractive, and that same effect was observed here — but only when this woman was rated by a man who wasn’t already involved with someone else.

Resource control was associated with preferences for physical attractiveness over good financial prospects and greater maximum partner age tolerated. … The results implicate the role of constraints on female access to and control of resources in sex-differentiated mate preferences and highlight differences between resource control and wealth.

Although neuroticism was negatively associated with marital satisfaction on average, it was unrelated to marital satisfaction when couples had engaged in relatively frequent sex over the past 6 months.

So when news broke this week that the FDA had approved Viibryd, a so-called sexy-friendly antidepressant, it caused quite a stir. Far too often, people are forced to choose between their mental and sexual health — as though these were entirely separate categories.

Damage to amygdala disinhibits two women: “For one to two hours after each seizure, she would engage in a wide variety of unusual sexual behaviors, such as masturbating in public and trying to seduce family members and neighbors.

There are at least 11 different sex-related sleep disorders, collectively referred to as “sexsomnia” or “sleepsex,” that affect people who are otherwise psychologically healthy—causing them to unknowingly engage in various sexual activities during the night.

Photo by Rudolf Koppitz

“Now, we know that females of many nonhuman primates and maybe even some nonprimates experience orgasm. But we still don’t know why.” (pdf)

Spermatologist Tim Birkhead recommends five books, inc. some on sperm competition

7 fascinating new findings” in sex science

We summarize in this review recent results showing that both the main and accessory olfactory systems are able to process partially overlapping sets of sexual chemosignals and that both systems support complimentary aspects in mate recognition and in the control of sexual behavior.

Olfactory systems in mate recognition and sexual behavior

Semen allergy suspected in rare post-orgasm illness

The mice showed the same scent preferences for male and female mice and vocalized for male and female mice equally. When the serotonin in these animals was replaced, they preferred female mice over male mice.

During contests between males, full eunuchs that had lost both pedipalps were better fighters than half eunuchs and intact males …. The scientists think that, once a male has lost his means of procreating, he protects his investment further by becoming a superwarrior.

It was From who told her it was her “scientific duty” to study homosexuals and promised her access to all the subjects she needed. Initially she demurred but eventually, with the encouragement of From and her colleague Bruno Klopfer, [Evelyn] Hooker began an investigation that would ultimately result in the removal of homosexuality as a form of psychopathology from the Diagnostic and Statistical Manual III of the American Psychiatric Association.

A review of New York Hustlers: Masculinity and Sex in Modern America

Dr. Petra on a lap-dancer study: “The problem with writings about lap dancing in the past have been either they’ve focused on entirely positive accounts, or been overtly negative and often hostile to/about dancers. … This research is different as it takes the experiences of dancers and discusses their lives in a way that doesn’t flinch from the problems they face when dancing, or the positive (and mundane) parts of their work.

Music for Wanking: Brian Eno discusses his porno collection with Chrissie Hynde, 1974

Drugs, drag queens, nude psychotherapy, tutorials on stripping, trepanation, women wreastling (sic), disco churches and a soundtrack by Piero Piccioni, a suspected murderer who himself would be a suitable subject for Naked England, is an irresistible mix that makes this flick a perfect candidate for restoration and a digital release.

Flaccid in Flanders — Belgian senator calls for a sex strike until political deadlock is broken

American Nudie Classics — “Your Grandpa’s Porn”

Ladies in red, scary mothers, more sex cannibals and cabaret

When a lady wears red it prompts men to ask her more intimate questions and to sit closer to her.”

A percentage-point increase in the male-to-female ratio of a man’s graduation class led to a percentage-point increase in his likelihood of dying before the age of 65.”

Following all three election cycles, individuals located in states voting for the winning political party tended to search for pornography keywords relatively more often than individuals residing in states voting for the losing political party.”

A review of porn.com, an edited collection that examines porn as a driving force behind tech (esp. internet) innovations

The Old Pornographers: Richard Nash and Mike Edison on Banned Books

Fifty of those women … were randomly chosen to receive a placebo instead of a drug treatment for low sexual arousal. … The findings … show that on average, one in three of the women who took a placebo showed an overall improvement.”

Bayer’s new vaginal atrophy drug

A skeptical challenge of the notion of a porn-addicted brain

A skeptical challenge directed at recent waist-to-hip ratio research

Twiggy

A neat post about Twiggy, the too-thin, not-very-curvaceous 1960′s super-model

According to the researchers, reduced contraceptive use is most likely the result of a decade of abstinence-only sex education.”

Psychologists at Temple University find “no evidence that the initiation of sexual intercourse is hastened by exposure to sexy media.”

Lindsay Beyerstein rounds up some sex ed links and takes a recent study to show that “nearly half of teenagers are already having sex, and many others are doing their best to get in on the action. It’s hard to imagine a more perfect audience for comprehensive sex ed.”

Simon Baron-Cohen wrote of the autistic mind as an “extreme male brain,” and now Mark Brosnan et al ask, “Can an ‘Extreme Female Brain’ be characterised in terms of psychosis?”

These researchers went looking for male-female brain differences but found none in the ‘resting’ state, using fMRI

Canada tosses most of its laws restricting prostitution: “Judge Himel found that laws set up to protect prostitutes actually endanger their safety, forcing them to furtively engage in hasty transactions conducted in shady locations.”

The well-known eastern Munich bordello told Bavarian daily tz on Thursday that taxi drivers are paid up to €120 for every ‘John’ they bring to their rivals during the annual autumn beer festival, when hundreds of thousands of visitors are in town for a good time.”

Matt Ridley on hard-wired sex differences: “In virtually every mammal and nearly all birds, males are more aggressive, females more nurturing. It is a distinction that goes right back to active sperm competing for stationary eggs. … Wombs are worth fighting over—and granting to favored applicants only.”

Females produce only a few, large gametes while males produce a greater number of small gametes. Because females invest more, and because their productivity is not usually limited by the availability of male gametes, females should be the choosy sex. … There are only a few examples of organisms that have reversed the usual relationship, and the [seahorses and pipefish] are one such group.”

Jacobus Boomsma … has argued that strict monogamous behavior, such as an ant queen mating for life, spurred the evolution of cooperative breeding in some social insects. Monogamy helps fulfill Hamilton’s conditions, because all siblings are equally related to each other and to each parent. Promiscuity, on the other hand, leads to many half-siblings and lowers the relatedness of individuals in a group.”

We hypothesized that men’s relationship satisfaction and investment would predict interest in their partner’s copulatory orgasm, and that sperm competition risk would moderate the association between relationship satisfaction and interest in partner’s copulatory orgasm.”

The 2011 German farm-girl calendar is out

This study clarifies the adaptive significance of infertile sperm castes, which has remained elusive in Drosophila. … We suggest that spermicide and male countermeasures against it are more common than is appreciated and discuss how spermicide could drive the evolution of several key male traits, including sperm size and number.”

By varying the adult sex ratio of populations of the Indian meal moth … we altered the frequency of male and female copulations, and thus the level of sperm competition experienced by males. As predicted by theory, males evolving under higher levels of sperm competition increased investment in sperm production and differed in their sperm allocation patterns across matings.”

We assess this key assumption in seed beetles where genital spines in males physically injure females. We demonstrate that male spine length is positively correlated with harm to females during mating but also that males with longer spines are more successful in sperm competition.”

Otto Dix's painting of Anita Berber

On sexual cannibalism in black widows, red-back spiders, etc.: “Why not eat him; he’s not much use later anyway. Mating success is so variable among males, there’s no guarantee that living another day will pay off for him.  Most males fail to mate at all and some research suggests that males become functionally sterile after mating. So, why not?

Penis captivus describes an event that occurs in rare instances during heterosexual intercourse when the muscles in the vagina clamp down on the penis much more firmly than usual (a form of vaginismus), making it impossible for the penis to withdraw from the vagina.”

Information from species in which females remain in their natal group … shows the importance of kin support, especially from mothers, on the reproductive success of their daughters. Therefore, one might expect a similar effect on sons in species in which males remain in their natal group like bonobos.”

Bare naked 1960′s psychotherapy: “Perhaps most notable was an exercise called “crotch eyeballing”, designed to dispel guilt about the body, in which participants were instructed to look at each others genitals and disclose the sexual experiences they felt most guilty about while lying naked in a circle with their legs in the air.”

Joey Heatherton

Humans in the highest economic bracket leave more grandchildren through sons than through daughters. Therefore, adaptive variation in sex ratios is expected, and human mothers in the highest economic bracket do give birth to more sons, suggesting similar sex ratio manipulation as seen in other mammals.”

Results showed (a) that greater maternal harshness at 54 months predicted earlier age of menarche [and] (b) that earlier age of menarche predicted greater sexual (but not other) risk taking

Piper Laurie plays the mother of Carrie (Sissy Spacek) in the 1976 movie Carrie

A talk with Museum of Sex curator Sarah Forbes

The Museum of Eroticism in Paris — 7 floors of erotic art inside an old cabaret

The strippers of Shoreditch

A neat blog: Cabaret Berlin — “exploring the entertainment of the Weimar era”

Freud, penile trauma, and the art of porn

Gia Carangi

Gia Carangi, a causualty of the 80′s drug culture

A short history of sex art

A 1996 article by Jon Stratton on the history of the idea of sex dolls

Porn for the Blind — “You can help. Record a description now.”

Cell phones, sitting around a lot, and not watching the right kind of porn leads to inferior sperm quality

For those who object to the rise of pornography studies as an academic subfield or balk at paying astronomical tuition so their kids can watch people boink on-screen for course credit, Linda Williams is the one to blame. Her landmark 1989 study Hard Core: Power, Pleasure, and the “Frenzy of the Visible” was the first book to take porn seriously as a film genre.

Dave Monroe of St. Petersburg College (Florida) has edited an anthology called Porn — Philosophy for Everyone: How to Think With Kink

The internet has changd the way porn writers depict sex. How one man nearly became a scribe of smut.

Oodles of stats on internet porn, including the nations with the highest porn revenues

As long as there is a stimulus-response cued reaction, your brain could care less if it was induced by a steamy night with a Russian supermodel, or by looking through the Victoria’s Secret catalog. Dopamine and oxytocin aren’t snobby that way.” (with a neat Helmut Newton pic)

Ordering sex in cyberspace: a content analysis of escort websites

In a study of tamarin monkeys, “Partners with a high level of oxytocin performed correspondingly more cuddling, grooming and sex, while those with low levels of oxytocin spent less time on these relationship-building activities.”

Infidelity punishment meted out by female salamanders

New and improved Oedipal theory, now with autosexuality: “You are sexually attracted to Your Parents, and Yourself

Oedipal theory confirmed in rats back in the 80′s

From the Freud Museum, London

The Freud Family (c. 1878), with Sigmund standing behind his mother, his back to his dad (who should be more worried by the guy with the sword)

Bering on Oediups 2.0, now with fetishes

‘“Simply put,” [James V. Kohl] concedes “pheromones don’t create desire, they merely enhance it. If you’re not desirable to start with, because your personality is disagreeable, you’re not going to get lucky by using pheromones.”’ I’d like to put that to the test.

A youth forensic psych unit in British Columbia discontinues its use of penile plethysmography, the ‘peter meter’

Are there different types of female orgasm? They’ve been debating this for eons. How hard can it be to figure out?

Sex disappears from the British novel

But not from the lives of British(-Norwegian) novelists — ‘How “drop dead gorgeous” Roald Dahl slept with countless women while working as a spy’

Not only were females who were having sex without condoms less depressed, but depressive symptoms and suicide attempts among females who used condoms were proportional to the consistency of condom use. … These data are consistent with the possibility that semen may antagonize depressive symptoms.’

Sex reduces anxiety-like behavior in rats

Sex makes you smarter — it promotes neuronal growth

The injury is defined as the traumatic rupture of the corpus cavernosum secondary to a blunt trauma of the erect penis. The condition is underreported. The commonest causes were coital injuries and penile manipulation. The diagnosis was usually fairly straightforward because of the stereotypical clinical presentation. Associated injuries included urethral rupture.’

Evaluation and management of gunshot wounds to the penis may potentially be complex. Retrograde urethrogram should be performed in all cases except the most insignificant and superficial wounds. We describe our technique of penile exploration and artificial erection, noting excellent results in patients for whom follow-up is available.’

Ducks, spiders & gluttony

Raquel Welch

Sexsomnia was reported by 7.6 percent of patients at a sleep disorders center, researchers report today.  Starting sex while asleep was more common in men (11 percent) than women (4 percent).

Australian authorities forbid soft porn from depicting the labia minora protruding outside the labia majora, which has stimulated a market for cosmetic surgery down under.

During the normal mating season, the penises of Lesser Scaup ducks grow about 4 centimeters longer than average, and those of Ruddy Ducks grow about 15 centimeters longer. But when the team made several Lesser Scaup males compete for just a few females, their penises grew up to 25% longer than normal.More here

Women and men could do that more quickly when the face had exaggerated sexual characteristics. ‘Women were quickest to classify gaze direction when they were looking at hunky, masculine-looking guys. Guys were quicker when they were looking at pretty, feminine women,’ says Jones.

Bernadette Lafont & Serge Marquand in Sophie's Ways

Are the women thereby honing in on the gaze of the guys with the best sperm? “A previous study of Spanish men reported that facial attractiveness was positively associated with semen quality. We aimed to determine whether this effect was widespread by examining a large sample of Australian men.

In Slate, William Saletan vented his disgust at the dangerous and grotesque display of gluttony that is  competitive eating, likening it to pornography (esp. in the article’s title — ‘Deep Throat: the Depravity of Major League Eating’). At Jezebel, Katy Kelleher dismissed his concerns. “Enjoying huge amounts of food or copious amounts of sex,” she says, “does not make one self-destructive, gluttonous, or depraved.” She’s right about sex but wrong about eating competitions. Since sex (safe sex) in large quantities doesn’t carry such a big health risk, there’s nothing wrong with it. In fact, it might even have the added value of boosting brain growth. Kelleher sets aside the health risks resulting from overeating by comparing them to the risks that stem from other sports. She suggests that we should just let people assume these risks if they choose to. But what about the other extreme for eating, namely, anorexia? Would she allow people to cultivate this condition, too, as long as they were aware of the resulting health risks?

For some people, good sex involves copious amounts of food: “Feederism is a fat fetish subculture in which individuals eroticize weight gain and feeding. Feeders are individuals who claim to become sexually aroused by feeding their partners and encouraging them to gain weight.

For male spiders, the health risks in mating are pretty steep. “Nephilid spiders are known for gigantic females and tiny males. Such extreme sexual dimorphism and male-biased sex ratios result in fierce male-male competition for mates. Intense sperm competition may be responsible for behaviors such as mate guarding, mate binding, opportunistic mating, genital mutilation, mating plugs and male castration (eunuchs).”

To curtail competition with their own sperm, males of several spider and insect species mutilate their genitals or sacrifice themselves entirely using their genital parts or their whole dead bodies as mating plugs. The orb-web spider, Argiope aurantia, is a species characterized by both male self-sacrifice and extreme female-biased sexual size dimorphism.

“Sexual cannibalism is common in the Australian golden orb-web spider (Nephila plumipes), in which the tip of the conductor typically breaks during copulation. … The likelihood of the conductor breaking depends upon the copulatory history of the female insemination duct: males were more likely to break their conductor if they inseminated a ‘virgin’ rather than ‘mated’ insemination duct.” (pdf)

Once he’s inseminated her, he’ll break off his genitalia in hers, thereby plugging her up. The male, which is left sterile, then drives away other males until he dies. This strategy should stymie other males’ mating attempts—though some females have been found with several dismembered male organs lodged inside them.” Very sadistic.

H. Biberstein's depiction of de Sade

‘The Enigma of the Will: Sade’s Psychology of Evil’

The end of Sex Week at The Loom

The Closing Time effect: “When it’s late in the evening, people get prettier. But they also found that, while alcohol does play some role in this aesthetic reevaluation, the correlation isn’t strong enough to completely explain it. It’s not just beer goggles; something else is going on.

Recent (or not) sex news

Mata Hari

Mata Hari, who pioneered the ‘honey trap’ and Greta Garbo’s Mata Hari movie (1931), which is apparently hard to find in its uncensored form

Japan’s penis & vagina festivals: “These are folk rites going back at least 1,500 years, into Japan’s agricultural past. They’re held to ensure a good harvest and promote baby-making.”

Review of Oniroku Dan’s Season of Infedility

Sex toys from the 1700′s sold at auction: ‘Auctioneer Wendy Wood said: “You might laugh but it’s a good opportunity for investment. You won’t see another one in a long time.’”

The feminist porn awards, which were covered by Violet Blue

The plight of a feminist sex submissive

The maker of Baise-Moi, Virginie Despentes, is interviewed

An interview of the folks who made the MRI video of two people during sex:

‘Vacuum cleaner injury to penis’: “Five cases of significant penile trauma resulting from this form of masturbation are presented.” (ht NCBI)

More about sperm rivalry in insects and in voles

Angry Mouse’s righteous sex rant at Daily Kos

A catalogue of unconventional sex conventions

Disease-free society helps effeminate men attract women

Classic Spanish novel, La Celestina (1499): “Celestina is a procuress who restores hymens and sells the body of young maidens as virgins – over and over again.”

Mistresse Matisse on M. Febos’ Whip Smart

How Jewish editors helped shape Playboy‘s mind

An issue of Granta devoted to sex

On the pleasure of having naked women read to you

Shhh! A survey of librarians about sex

Formicophilia, “Fetish of having bugs crawl around on your genitalia

Olivia Judson on evolving sexual tensions (lots on sage-grouses)

Car crash leaves woman in a state of continual sexual arousal, or (to use the technical term), Persistent Sexual Arousal, which was covered by ABC News and is thought by some to be associated with increased soy intake. It’s been re-named Persistent Genital Arousal Disorder. Here’s another case, allegedly caused by a Wii Fit injury

Multiple Sclerosis can also cause hypersexuality

Sleeping Beauty Paraphilia — after head trauma, a man gets aroused by viewing sleeping women. “This case report highlights the potential link between paraphilia, deviant and aggressive sexual behaviour, neurological disturbance and self-representation.”

Epileptic seizures have been known to cause orgasms. In one case, the seizure-orgasm was triggered by toothbrushing

In the late 1890′s, half a century before Kinsey, Dr. Clelia Mosher surveyed women about their sexual practices

Mind Hacks on an article about heart attacks and sex: “All reported cardiac deaths surrounding sexual conduct involved extramarital sex, suggesting psychological stress as an added factor.”

The sad story of a sportswriter with gender dysphoria

The hijra of south Asia: “Asked whether the hijra family members were all congenital eunuchs and hermaphrodites, Nanni, 35, insisted that they were all born that way.” More on the hijra

Gandhi’s sex life

A book about the sexploits of Western men from Asia to North Africa over the past several centuries

Candy Barr was hot! And perky, very perky!

Sperm competition, stress and more

Adrienne Fidelin

Ady Fidelin

The best predictors of how sexual a woman is

The great sperm race

Insect sperm wars

Sperm competition, cooperation

Three posts on the male reproductive anatomy at Neurotopia

Gaze direction affects judgments of facial attractiveness

What kind of erotic film clips should be used in female sex research?

Six revelations about women and sex

Scientific American on the female orgasm

Thinking yourself to orgasm

Veruschka as Salomé

Cuba pays for sex-change operations

I prefer the purity of nudes, says cheeky Rankin

Erotic art at Flavorwire

The geek’s guide to getting girls (with an impressive scientific bibliography)

As the use of porn increases, the rate of sex crimes goes down

Stress makes men prefer dissimilar mates

Ady Fidelin & Nusch Eluard

The Marilyn Monroe Lounge

Elvis’ lady-friends

The 1954 obscenity trial over Stanley Kauffmann’s The Philanderer

Femme fatale makes men take risks (details)

Graphic novel based on The Story of O

A review of Whip Smart by former dominatrix, Melissa Febos