Some people like big butts and they cannot lie. And evolution has certainly shown the maximized gluteus favor: those bountiful booties are associated with curvier spines, which keep pregnant women mobile by enabling them to shift their weight and thus make the trait more desirable to males. Medical science, however, now makes it possible to skip evolution and go straight to surgery.

There are, of course, non-aesthetic medical reasons for butt augmentation, such as correcting a defect that impairs walking. But the procedure is most popular for its cosmetic purposes: for people born with flatter backsides, or those simply looking for a tune-up, butt implants could be a way to get the rump they’ve always wanted. The facts: