A daily diary analysis of the associations among stress, closeness, and relationship and sexual satisfaction was conducted with a sample of 40 gay male and 55 lesbian couples. Using interdependence theory as a guide, both actor and partner effects of stress, closeness, and their interaction were investigated. As predicted, it was found that participants' own feelings of closeness toward their partners buffered the negative association between stress and satisfaction but that when participants' partners felt particularly close on a stressful day their closeness exacerbated associations between stress and reduced satisfaction. These contrasting effects of closeness underscore the importance of considering the daily processes of both partners contributing to relationship quality.