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When published in hardcover, this provocative tome about human sexuality was greeted by enthusiastic reviews and firm denunciations. In Sex at Dawn, Christopher Ryan and Cacilda Jethá argue that the human urge to sexually stray is built into our evolutionary makeup. To make their points, they draw on evolutionary research about our primate cousins, but also on recent studies of human behavior. Make no mistake though; this is not just a Darwinian discourse: The Spanish husband and wife team maintain that old trade-off between man's protection and possessions in exchange for a woman's fertility and fidelity are now collapsing. New thoughts on monogamy.