This investigation explored the role of sexual attitude similarity in sexually involved romantic couples. Findings indicate that sexual attitudes of partners are positively correlated, and that partners exhibit significantly greater levels of similarity than randomly generated couples. Similarity in sexual attitudes did not vary as a function of length of relationship or length of sexual involvement. Gender differences were evident in the correlations between certain types of sexual attitudes and the four indicators of relationship quality: sexual satisfaction, relational satisfaction, commitment, and sexual communication satisfaction. In addition, sexual communication satisfaction mediated the effect of sexual attitude similarity on both males' and females' sexual satisfaction.