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Evolution of jealousy and infidelity from "summary" of Evolutionary Psychology by David Buss
One of the central themes in evolutionary psychology is the study of jealousy and infidelity from an evolutionary perspective. Evolutionary psychologists propose that jealousy and infidelity are not just random emotions or behaviors, but rather evolved adaptations that served a specific purpose in our ancestral past. Jealousy, for example, is thought to have evolved as a mechanism to protect valuable resources such as a mate or offspring. In our evolutionary past, resources were scarce and competition was fierce. Individuals who were able to successfully mate and reproduce needed to ensure that their partners were not investing resources in others. Jealousy, therefore, served as a way to deter potential rivals and maintain a partner's commitment. Infidelity, on the other hand, is seen as a strategy that may have provided reproductive benefits in certain circumstances...
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