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The Moral Animal: Why We Are, the Way We Are: The New Science of Evolutionary Psychology
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Constants do not count in mating decisions.
David M. Buss • The Evolution of Desire: Strategies of Human Mating


Modern men are descendants of those who erred in the jealous direction, even when this error produced some marital friction.
David M. Buss • The Dangerous Passion: Why Jealousy Is as Necessary as Love and Sex
The evolution of characteristics because of their mating benefits, rather than survival benefits, is known as sexual selection.
David M. Buss • The Evolution of Desire: Strategies of Human Mating

The most dramatic threats to the fragile unions between men and women, in short, are the dual specters of infidelity and abandonment. These dangers constituted threats so extreme that, unless they could be successfully combated, or at least partially subdued, long-term romantic bonds of love and marriage could not have emerged at all.
David M. Buss • The Dangerous Passion: Why Jealousy Is as Necessary as Love and Sex
Partners lower in desirability, in short, are more easily threatened and more jealous.