Anal-sex is increasingly popular in the hetero world.

Every couple of years, another once-scandalous sex taboo starts making its way toward the commonplace. A decade ago, blow jobs were what people whispered about; then three-ways became the naughty bedroom act. Now, it’s anal sex—but according to the Centers for Disease Control’s National Survey of Family Growth, it’s rapidly becoming a regular feature of hetero couples’ horizontal activities.