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If we all want love, why is there so much conflict in our most cherished relationships? To answer this question, argues the prominent psychologist David M. Buss, we must look into our evolutionary past. Based on the most massive study of human mating ever undertaken, encompassing more than 10,000 people of all ages from thirty-seven cultures worldwide, The Evolution of Desire is the first book to present a unified theory of human mating behavior. In this fully revised and updated edition of The Evolution of Desire, Buss has incorporated the explosion of research in the field of human mating since its original 1994 publication, from startling discoveries about the evolutionary advantages of infidelity and physical attractiveness to new findings regarding sexual orientation, the emotion of sexual disgust, and incest avoidance adaptations.