In this article, we review the major research advances made during the 1990s in the study of sexuality in marriage and other close relationships. More specifically, we provide a critical review of the empirical findings from the last decade on such sexual phenomena as sexual behavior, sexual satisfaction, and sexual attitudes within the context of marriage, dating, and other committed relationships. After highlighting the major theoretical and methodological advances of the 1990s, we focus on the research literatures of: (1) frequency and correlates of sexual activity in marriage; (2) sexual satisfaction, including its association with general relationship satisfaction; (3) sexuality in gay and lesbian committed relationships; (4) trends in sexual behavior and attitudes in dating relationships; and (5) the role of sexuality in dating relationships. We also incorporate brief reviews of the past decade's research on sexual assault and coercion in marriage and dating and on extramarital sex. We end our decade review with recommendations for the study of sexuality into the next decade.