Impure Lesbians of Sodom
Why are bisexual women more likely to have tried anal sex?
Have you heard the latest report on Americans' sex habits? The study, Sexual Behavior, Sexual Attraction, and Sexual Identity in the United States, comes from the National Survey of Family Growth, the country's most respected periodic sex survey. Media reports about the study have noted what seems to be a resurgence of virginity. But the data also show something more surprising: Compared with women who are totally straight, women who are slightly bisexual are more likely to have tried various sex acts with men. In fact, compared with totally straight women, women who are fully bisexual or lesbian are more likely to have tried anal sex.
Let's start with the study's more obvious findings.
1. Virginity restoration. You can't recover your lost virginity. But as libertines age and virgins are born, a country can recover its old virginity rate. In the 2002 NSFG survey, 22 percent of men and women between the ages of 15 and 24 said they had never had sexual contact with another person. But in the latest NSFG survey, taken from 2006 to 2008, that number increased to 27 percent of men and 29 percent of women (Table 7, Page 38). In the broader age pool, the trend is diluted but still shows up: Among people ages 15-44, the percentage reporting zero lifetime opposite sex partners increased by two points among men (Table 4, Page 35) and three points among women (Table 3, Page 34). (In case you're wondering, no, there was no shift in reported homosexuality that would account for this increase.) The percentage of men ages 15-44 who reported only one lifetime female partner also increased by two to three points. So if you thought sexual mores were moving inexorably in the direction of more, earlier, and kinkier activity, think again. Virginity can return, and apparently, it has.
2. Normality and age. At ages 15-17, only 33 percent of females and 32 percent of males say they've had vaginal sex. By ages 18-19, the norm has reversed: 62 percent of females and 66 percent of males say they've done it. And by ages 20-24, 85 percent of women and 82 percent of men have done it. Oral sex follows a similar trajectory: The percentage of females who say they've done it goes from 30 percent at ages 15-17 to 63 percent age ages 18-19, and then to 81 percent at ages 20-24. In the same sequence of age brackets, the percentage of males who say they've done it goes from 35 to 70 to 80. Statistically, both acts are abnormal below age 18 but normal above it.
3. The top of the bottom? Five months ago, I noted that a different sex survey showed a big, long-term increase in anal sex reported by women. But there's no guarantee that this trend will continue. In the NSFG, anal sex, like vaginal and oral sex, becomes far more common as teenagers mature. Between ages 18-19 and 20-24, it doubles in prevalence in both sexes. Still, it peaks at 39 percent among women and 45 percent among men, never crossing the statistical threshold of normality. And the percentage of people ages 15-44 who say they've had anal sex hardly budged from 2002 to 2006-8. (It went from 34 to 35.8 percent among men, and from 30 to 30.7 percent among women—not a significant difference.) So it's possible that the surge of reported anal sex will peter out.
4. The heterosexuality gap. In 2002, among people ages 18-44, men were more likely than women to report being attracted only to the opposite sex. At that time, the gap was six to seven percentage points. In the 2006-8 data, the gap has increased to more than 10 percentage points. Ninety-four percent of men, compared with 83 percent of women, say they're attracted only to the opposite sex. (Table 11, Page 42.) Why? Maybe, as anecdotes suggest, women's sexuality is, on average, more fluid than men's. Maybe the taboo against lesbianism has relaxed more than the taboo against male homosexuality. Either way, the gap bears watching.
5. Bisexuality and experimentation. Among men ages 18-44, homosexuality correlates with sex acts as you'd expect. The gayer the man, the less likely he is to have had any kind of sex with a woman (Table 14, Page 45).
But this pattern doesn't hold among women. Start with vaginal sex. Women who say they're attracted only to men are more likely to report that they've had vaginal sex than are women who say they're equally, mostly, or exclusively attracted to women. That makes perfect sense. But women who say they're attracted mostly to men are even more likely to report having had vaginal sex. Isn't that odd? A woman who's mostly rather than entirely straight presumably diverts some of her sexual energy away from men. How does she end up more likely to have had vaginal intercourse?
You could brush off this oddity by noting that the range of variation among these three groups of women, in terms of whether they've had vaginal sex, is fairly narrow. But shift your attention to oral sex, and the pattern gets sharper. Women who say they're attracted only to men are more likely to report having had oral sex with a man than are women who say they're equally, mostly, or exclusively attracted to women. But women who say they're attracted mostly to men are even more likely to report oral sex with a man. And here, the gap is bigger: Compared with exclusively straight women, mostly straight women are more likely to have had oral sex with a man by a margin of 9 percentage points.
Will Saletan covers science, technology, and politics for Slate and says a lot of things that get him in trouble.
Photograph of one man and two women by iStockphoto/Thinkstock.