In support of the fantastic bonus theory, Lloyd points out that only about 8 percent of women reliably have otherwise unassisted orgasms during penile-vaginal intercourse, while nearly all men do. Women get a parallel ability as a “fantastic bonus” because their tissues and nerves are laid down at the same time during fetal development. The male orgasm positively reinforces ejaculation and therefore encourages males to propagate the species, Lloyd says. It has a clear function in one sex, but not in the other,” she says. “The female orgasm is like the male nipple. The current evidence, she says, suggests the female orgasm is simply a byproduct of the male orgasm. While there’s solid evidence for sperm competition, there’s less grounding for the theory that women’s orgasms have anything to do with fertilization, says Elisabeth Lloyd, PhD, a science historian at Indiana University, Bloomington, and author of “The Case of the Female Orgasm: Bias in the Science of Evolution” (Harvard University Press, 2005). Male mountain gorillas, in comparison, face a low risk of sperm competition because they keep close watch over a harem of females, possibly explaining their relatively small testicles.
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That’s why men have relatively large testicles and produce so many sperm, Dixson posits. Dixson, PhD, in his book, “Sexual Selection and the Origin of Human Mating Systems” (Oxford University Press, 2009). Humans probably evolved in societies in which it was common for a woman to sleep with many men over a relatively short period of time, argues biologist Alan S. “Our research gives some preliminary evidence supporting the idea that the female orgasm functions to selectively uptake a particular man’s sperm over another,” McKibbin says. The study found that the men most interested in their partners’ future orgasm were the ones who hadn’t seen much of their girlfriends or wives lately.īut why reward potential infidelity with orgasms? The men also revealed how much they wanted their partners to climax the next time they had sex, and how hard they’d work to make it happen. McKibbin and his colleagues surveyed 299 heterosexual men in committed relationships, asking how much time they had spent with their partners since they last had sex. Like Harry, 90 percent of men say they care if their partners have orgasms, and there may be a deeply rooted reason for that, according to a study by McKibbin, published in Personality and Individual Differences (Vol. “Sexuality is such an important part of people’s lives.” ‘Fantastic bonus’ or fertility control? “We can’t leave it to pop culture and movies to explain these things,” says Cooper.
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Orgasms are, after all, a major motivating factor behind many human behaviors, and they play a crucial role in the story of our species’ evolution, Cooper says. While this research may not lead to a cure for cancer, it isn’t frivolous.
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In the past few years, however, scientists have conducted a slew of studies and written several books on the topic - with the function of female orgasms emerging as a particularly hot area of debate. “Some women may fake it ’til they make it,” says Cooper, who presented her research at APA’s 2010 Annual Convention in San Diego.Ĭooper and McKibbin are among a growing number of scientists studying the human orgasm, a topic frequently covered by women’s magazines but relatively unexplored by the research community. Cooper, a clinical psychology doctoral student at Temple University. Depending on a woman’s motivation, pretending to orgasm can actually increase her sexual satisfaction, according to research by Erin B. What is surprising: Faking isn’t always bad for your sex life. With 28 percent of men occasionally faking it themselves, they shouldn’t be too surprised. “The men also reported they’d be distressed to find out their partners were faking,” says McKibbin. And like Harry, most men don’t believe it could happen to them, with only 20 percent saying they think their female partners might fake, according to another yet-to-be published study by William McKibbin, PhD, a psychology professor at the University of Michigan, Flint. Sixty-seven percent of heterosexual women admitted to occasionally faking orgasm in a study published last year in the Journal of Sex Research (Vol. “Well, they haven’t faked it with me,” Harry (Billy Crystal) retorts.
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“Most women at one time or another have faked it,” she says. Remember the Katz’s Deli scene in “When Harry Met Sally” when Sally (Meg Ryan) writhes and moans and pounds on the table to demonstrate her pitch-perfect imitation of la petite mort?