The Kama Sutra gives detailed instructions on how to spank it. Contemporary Italians touch it for luck before placing a bet. Americans are having it cosmetically enhanced at rates approaching breast enlargement surgery. The female butt, tush, culo, or derrière has always inspired awe, fantasy, and slavish devotion.

Curiously, its primary purpose is functional rather than aesthetic: butts balance our bodies while running, according to biologists. But ask any pygophiliac—as fundament fans are clinically termed—and you’ll get the same answer: female hindquarters exist to please the eye, the hands, and parts south. A pert posterior causes instant arousal, as Zora Neale Hurston observed in Their Eyes Were Watching God: "The men noticed her firm buttocks like she had grape fruits in her hip pockets." Or, as rapper Sir Mix-a-lot proclaimed, "My anaconda don’t want none, unless you’ve got buns, hun."

Having all but disappeared from wester