One of the most provocative pieces we have published in some time was our Aug. 15 cover story arguing that humans are genetically predisposed to sexual infidelity. It drew nearly 800 letters from readers (many predictably indignant), the fourth largest mail response to any story this year. That article was based on a current book that is also stirring debate among readers and scientists: The Moral Animal: Evolutionary Psychology and Everyday Life (Pantheon; $27.50). The New York Times called it "a feast of great thinking and writing about the most profound issues there are."
The author of both the cover story...
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