Fisher disputes this, offering four reasons why adultery could have been biologically adaptive for our female ancestors. First, a diversity of male partners could provide a woman with a variety of practical and material benefits for her and her offspring; second, adultery was a form of insurance in case a woman’s primary partner died or left; third, if a woman had a partner who was defective physically or emotionally, she could ‘upgrade’ her genetic line by having children by a more viable male; fourth, having children with a variety of partners, increased the likelihood that some of them
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