This example illustrates a few key points. First, cultural inventions such as the birth control pill fundamentally change the ground rules within which human sexuality gets expressed—they alter the cost-benefit calculus of sexual behavior, in this case severing the link between sexual intercourse and conception. Second, some components of our sexual psychology, exquisitely adaptive in the past, may no longer be adaptive in modern cultural contexts. Third, some aspects of our sexual psychology continue to get expressed despite the modern absence of the evolutionary pressures responsible for
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