Women (N = 692) in romantic relationships (average duration approximately two years) responded to an online survey. The women self-reported their own as well as their partners' physical attractiveness, revealing significant perceived matching in physical attractiveness, as well as a tendency to rate their partners as more attractive than themselves. The women completed the Resistance to Mate Guarding Scale as well as other measures of relationship attitudes and behaviors. Women who perceived themselves as more attractive than their mates more strongly resisted mate guarding; the strongest relationships were with the subscales of Covert Resistance Behaviors, Resisting Public Displays of Affection, and Avoiding Partner Contact. When women perceived themselves as more attractive than their mates, they also reported less commitment, more flirting with other men, more appealing dating alternatives, and more frequent thoughts about breaking up.