Early women who had sex before securing a commitment were more likely to be left without a partner to help during the pregnancy and childrearing. Explanatory theories based on differences in _____________ would argue that many modern women's tendency to insist on some indication of commitment before having sex is a direct, inherited, and adaptive result.

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Theories based on parental investment argue that because women historically have had to invest more in childrearing (e.g., pregnancy, breastfeeding), they evolved to be more selective in choosing a partner, preferring those who show signs of commitment to ensure support for their offspring. This selectiveness is seen as an adaptive result of evolutionary pressures.

Early Women Who Had Sex Before Securing a Commitment Were