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."