--- - |2 Kissing during late adolescence and the transition to adulthood is prevalent, relatively frequent, and distinct from many sexual behaviors in that it affords positive consequences with minimal risk. In this study, we examined within‐person associations between kissing and day‐to‐day variation in affect. A racially/ethnically diverse sample of college students (N = 560; 54.1% female) completed up to 14 daily surveys for seven consecutive semesters. On days when students kissed, they reported more positive and less negative affect than on other days, after controlling for a number of known correlates. Findings differed at the semester‐ and person levels. Findings contribute to a normative developmental understanding of sexual behaviors during adolescence and the transition to adulthood. - Journal of Research on Adolescence, EarlyView.