It's hard, perhaps, to recall that once sex was radical politics conducted by other means. When Wilhelm Reich coined the phrase "the sexual revolution," he meant transformation in every sphere: health, marriage, economics, morality, and government. It was in sex, he believed, that we found the integrated self, liberated from the alienating culture and the authoritarian state. Christopher Turner's new book is in part a report from that past, when sex held the promise of social reform.