Abstract
AbstractWe tested evolution‐based hypotheses about (1) sex differences in perceived benefits and costs of opposite‐sex friendship and (2) differences in perceived benefits of same‐sex friendships and opposite‐sex friendships. In the Preliminary Study (N= 400), an act nomination procedure was used to identify the benefits and costs of same‐sex friendships and opposite‐sex friendships. In Study 1, a total of 231 participants (100 men, 131 women) evaluated the frequency of occurrence of 100 benefits and costs in their closest same‐sex friendship or opposite‐sex friendship. In Study 2, a total of 229 participants (92 men, 137 women) evaluated how beneficial and how costly each would be if it were to occur in their closest same‐sex friendship or opposite‐sex friendship. Results supported several key hypotheses. Men perceived sex with their opposite‐sex friends as more beneficial than did women. Women reported receiving protection from their opposite‐sex friends more often than did men, and they perceived the protection as highly beneficial. Both men and women reported receiving information from opposite‐sex friends about how to attract mates, and they perceived this information as beneficial. The discussion focuses on whether these benefits reflect an evolved psychology of opposite‐sex friendship, or instead are incidental by‐products.
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