The Big Butt Book

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 ...