One of the most popular sex positions has long been a taboo topic. We tapped an expert to get the bottom of anal sex so you can too! There's nothing like having a Sex and the City -esque chat with your friends to make you feel ahead or behind the sexual curve, particularly when that curve is the butt. If it seems like they're all trying anal sex, that's not a crazy assumption: 36 percent of women between ages 15 and 44 have had heterosexual anal sex in their lifetimes, and 13 percent have done so recently, according to new research in the Journal of Sexual Medicine. If you haven't taken part in any butt play yet-or even if you have-many aspects might seem myserious or embarrassing.