Abstract
Men who have sex with men (MSM) in primary relationships engage in condomless sex both within and outside their relationships and a majority of HIV transmission risk may actually occur within primary relationships. Sexual agreements regarding non-monogamy are a critical component to understanding HIV prevention in male couples. Relationship factors have been associated with how sexual agreements function and power is one dyadic construct likely to affect couple's maintenance of non-monogamy agreements. Multilevel modeling was used in a cross-sectional study of gay male couples (N = 566 couples) to examine associations between partners' demographic characteristics traditionally used to define relationship power, a scale of decision-making power, and outcomes related to sexual agreements, including investment, agreement breaks, and break disclosure. Results indicated that decision-making power relative to one's partner was not associated with any agreement outcome, contrary to hypotheses. However, controlling for decision-making power, demographic bases of power were variably associated with sexual agreements' functioning. Younger partners were less invested in and more frequently broke their agreements. Lower-earning partners broke their agreements more frequently, but also disclosed breaks more often. White men in white-minority relationships broke their agreement more often than their partners. Concordant HIV-positive couples were less invested in their agreements and HIV-positive men disclosed breaks more frequently. HIV prevention efforts for same-sex couples must attend to the social, developmental, and cultural influences that affect their agreements around non-monogamy.