Nowadays we believe that consenting adults have the freedom to do what they like with their own bodies. We publicise and celebrate sex; we discuss it endlessly; we are obsessed with the sex lives of celebrities. We think it wrong that in other cultures people suffer for their sexual orientation, that women are treated as second-class citizens, or that adulterers are put to death. Yet until quite recently our own society was like this too. For most of western history, all sex outside marriage was illegal, and the church, the state, and ordinary people all devoted huge efforts to suppressing and punishing it. This was a central feature of Christian civilization, one that had steadily grown in importance since the early middle ages. In this brilliant, ground-breaking book, Faramerz Dabhoiwala describes in dramatic detail how, between 1600 and 1800, this entire world view was shattered by revolutionary new ideas - that sex is a private matter; that morality cannot be imposed by...