In 1980, 30 married couples had engaged in a low-conflict and a high-conflict conversational interaction while continuous physiological data were obtained. In a separate session each spouse had provided a continuous self-report of affect while viewing the videotape of the interaction. In 1983, 19 of these couples were re-located to determine the change in relationship satisfaction that had occurred over the preceding 3 years. A broadly based pattern of physiological arousal (across spouses, interaction segments, and physiological measures) in 1980 was found to predict decline in marital satisfaction; the more aroused the couple was during the 1980 interactions, the more their marital satisfaction declined over the ensuing 3 years. Several affective variables also predicted decline in marital satisfaction, including a pronounced sex difference in negative affect reciprocity: Marital satisfaction declined most when husbands did not reciprocate their wives' negative affect, and when wives did reciprocate their husbands' negative affect.