The authors hypothesized that people form opposite-sex friendships (OSFs), in part, to acquire long-term mates (both sexes), to gain short-term sexual access (men more than women), and to gain physical protection (women more than men). In Study 1, men and women evaluated reasons for initiating OSFs, characteristics preferred in an OSF, and reasons for ending OSFs. Study 2 extended the framework to include individual differences in sociosexual orientation. Compared with women, men judged sexual attraction and a desire for sex as more important reasons for initiating OSFs, reported a preference for sexual attractiveness when selecting OSFs, and judged the lack of sex as a more important reason for dissolving OSFs. Women judged physical protection as a more important reason for initiating OSFs and the lack of it as a more important reason for dissolving them. Across sex, people with an unrestricted sexual style were more likely to perceive OSFs as opportunities for sex. Discussion addresses the implications of the results for understanding conflict in OSFs.
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