Studies of collegiate sexuality have not examined infidelity. Using in-depth peer interviews with college students, our article investigates the meanings and practices of "monogamy" and "cheating" for college women. College women use ideas about age, class, and gender to construct collegiate sexuality as a kind of "monogamy lite" exempt from the "rules" of adult sexuality. Many have cheated themselves. Simultaneously, they define "real" relationships as exclusive and condemn "cheaters" as bad people. We employ an intersectional analysis to analyze these discrepancies, arguing that the multiple meanings women use reconcile contradictions between expectations for women’s sexuality and expectations about collegiate behavior, allowing women to sustain a commitment to relationships while also participating in collegiate sexual culture. Moreover, by providing a socially legible, gender-appropriate way to end unwanted relationships, these meanings allow women to use cheating to solve dilemmas in their intimate lives. In this case, college women use middle-class ideas about the transition to adulthood to resist gendered imperatives.