Commitment and Extra-Dyadic Sexual Activity in College Students' Friends with Benefits Relationships: Moderating Effects of Gender.

Friends with benefits relationships (FWBRs) are a common form of relationship for college students that combine aspects of friendship with sex, yet little is known about commitment in these relationships and whether they are more similar to casual relationships or to romantic relationships. We investigated associations between investment, alternatives, and satisfaction, with commitment (per the Investment Model) in college students' FWBRs and examined how associations between variables differ by participant and partner gender. Primary analyses were conducted with male-female FWBRs ( = 252). Male-male ( = 19) and female-female ( = 4) FWBRs are described. Investment was the strongest predictor of commitment for participants in male-female FWBRs, with commitment higher among women than men when investment was high. Additionally, participants' perceptions that their own and their partners' commitment was asymmetrical, as well as reports of extra-dyadic sexual activity (i.e., sex outside the FWBR) correlated with lower commitment to the FWBR. Overall, results suggest that FWBRs can be distinguished not only from other casual sexual relationships such as hookups but can also be differentiated from romantic relationships. Future research and intervention work should measure commitment and investment to predict how these relationships can persist, as well as transition, over time.