Public Lives Private Secrets: Gender, Honor, Sexuality, and Illegitimacy in Colonial Spanish America by Ann Twinam

In a way, it is a book about sex in colonial Latin America, but it is really more about the consequences for all of the people involved. Men and women paid for sexual indiscretions differently, illegitimate children were stained without honor, and people paid large sums of money to have the crown award them legitimacy. Fascinating really.