I would be remiss if I did not link you to William Salatan’s article The Riddle of the Sphincter: Why do women who have anal sex get more orgasms?

The survey data is real; it’s the explanation that’s uncertain. So he lays out more than a dozen possible theories to explain the data, and it’s quite an interesting read:

9. Love and trust cause orgasms and anal sex.

One woman writes:

The more I love and trust someone, the more likely I am to have an orgasm while with him—and the more likely I am to be okay with pushing society’s “norms” with him. Similarly, the more he proves that he knows what he’s doing, the more likely I am to let him do something that could potentially really, really hurt me.

This is the most uplifting theory. It implies that the sample of women who report regular anal sex is heavily biased toward intimate relationships. The data strongly support this. Compared with women who are single and dating, women in a relationship are only about 50 percent more likely, at best, to report vaginal sex in the last 90 days. But they’re two to three times more likely to report anal sex. And women who live with their boyfriends are more likely to report anal sex—but not more likely to report vaginal sex—than women who don’t. Anal sex, more so than vaginal sex, seems to correlate with intimacy and commitment.

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