"A controversial, idea-driven book that challenges everything you know about sex, marriage, family, and society"--Provided by publisher. Since Darwin's day, we've been told that sexual monogamy comes naturally to our species. But this narrative is collapsing. Here, renegade thinkers Christopher Ryan and Cacilda Jethá, while debunking almost everything we "know" about sex, offer a bold alternative explanation. Ryan and Jethá's central contention is that human beings evolved in egalitarian groups…Show more