The Evolutionary Case Against Monogamy

Christopher Ryan and Cacilda Jethá have a new book on the evolution of sexuality. They argue - duh - that monogamy is unnatural:

Biologists distinguish sexual monogamy from social monogamy. As DNAtesting has grown cheaper in recent years, we've learned that mostspecies formerly classified as "monogamous" (primarily birds) are socially monogamous, but not sexually so.In other words, they form pairs that cooperatively care for thatseason's brood of young, but the male may well not be the...