This chapter examines the relationship between beauty, dating, and desirability, paying particular attention to the role of sexual capital in structuring the intimate relationships of young adults. We draw on a sexual fields perspective, which elucidates how sexual fields condition sexual interactions, and address the contemporary research on young adult dating. In doing so, we move beyond understandings of beauty, which often emphasize physical appearance, to examine the role of sexual capital and desirability in shaping the dating practices of young adults. We use the case of the hook-up culture—which promotes casual sex over committed relationships—to examine the sexual field of young adult dating. We then present empirical findings from the U.S. Dating and Desirability Study to illustrate how sexual capital—which reflects systems of race, class, and gender—shapes women’s constructions of desirability within the field of the hook-up culture. We show how women who construct desirability in ways that align with the sexual values of the hook-up culture report more positive dating experiences than those who violate the expectations of casualness. We suggest that future research would benefit from greater attention to emerging technologies, the dating life course, and cross-cultural and intersectional perspectives.