"Move on to anal sex, and the pattern gets even stranger. Again, women attracted mostly to men are more likely to say they've had anal sex with a man than are women attracted only to men. And in the case of anal sex, the gap is huge: While 30 percent of the totally straight women say they've had anal sex, 55 percent of the mostly straight women say they've done it. But get this: Among women who say they're attracted equally, mostly, or exclusively to women, the figure is 41 percent. Lesbian and bisexual women are more likely than totally straight women to say they've had anal sex with a man.
If you find this number hard to believe, check it against a related finding in the same table: 48 percent of women who self-identify as gay or bisexual report having had anal sex with a man, compared with 33 percent of women who self-identify as straight. This gap is true of anal sex, but not of vaginal or oral sex.
What could explain this?"
WHY ARE BISEXUAL WOMEN MORE LIKELY TO HAVE TRIED ANAL SEX?