Female Orgasm May Be Tied to 'Rule of Thumb'

Four years ago, Wallen set out to do a well-controlled modern study with the collaboration of Elisabeth Lloyd, a professor of history, philosophical science and biology at the Indiana University.

Lloyd's study of 80 years of previous sex research in her 2005 book, "The Case of the Female Orgasm," debunked theories that there is an evolutionary reason for the female orgasm.

She determined the female orgasm is merely a byproduct of the male orgasm, as both sexes share the same genital nerve tissue in the fetal stage.

"It is perfectly normal not to have orgasms and there were lots of women in evolutionary time who had no orgasms and it had no impact on their fertility," said Lloyd.

Current studies bear this out, according to the researchers: 98 percent of men say they "always" reach orgasm during sex, while women are "evenly distributed" between "always and never."

Sexual Pleasure in Women Not Evolutionary

"It's clear the male orgasm is strongly selected and it makes sense," said Wallen. "If they don't reach orgasm, they don't leave offspring."

To look at the question in reverse, women have a strong evolutionary selection for nipples -- without them their babies would die, according to Wallen. However, nipples serve no biological purpose in men.

In analysis of the Bonaparte data, the researchers first had to reframe the question. Instead of asking, "Do you have orgasm during intercourse?" they created a "more explicit survey" asking if manual or oral stimulation had been involved.

After analyzing data from 100 female volunteers, ranging from 18 to 60, they found about 11 percent said they always have orgasm during intercourse and the same number said they never climaxed.

Because these surveys were anonymous, Wallen and Lloyd will now re-administer the questions to a new group of women. Ultimately, they hope to design a device that women can use in the privacy of their homes to measure their C-V distance.

Wallen said that if men and women knew the reality of their biology, their sex might improve.

"What is startling and surprising to me is that both men and women buy into the same sort of cultural model," he said. "If he is a good lover, he can bring me to orgasm with his penis alone. And a man buys into that and doesn't offer any kind of stimulation. And because he's not any good, she won't say anything because it's emasculating."

But Susie Bright, a feminist and sex columnist for Jezebel.com, said such studies on the "anomalies" of the female genitalia are "foolish."

"We need to know how to talk about sex and communicate about what feels good and not be so scared," she told ABCNews.com. "It would be helpful if women knew as much about their 'clits' as men do about their penises."

She said that, particularly in young people, misinformation and religious shame prevent many women from enjoying sex. Bright is also critical of abstinence programs and cuts in science classes.

"We should speak to the greater issues, even if there is some validity to this observation," she said. "It's such a miniscule part of womanhood and it's missing the boat."

"I know there's a lot of interest in the female genitals, but that does not get at women's orgasmic possibilities," said Bright. "Knowing that they are different, they will say, 'Oh my God, what is wrong with my vulva?"

Study scientist Lloyd agrees that too much emphasis is placed on models of female sexuality that are created by Hollywood and the pornography industry.

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