The purpose of this study was to examine the relationships between social support, coping, mood and sexual risk behavior. Participants were 122 HIV-positive adults (60 women and 62 men). All participants were assessed on sexual risk behavior, perceived partner social support, coping with HIV/AIDS and mood. The results showed that sexual risk behavior was associated with male gender, education, perceived support of their partners and the use of emotion-focused coping style to deal with living with HIV and AIDS. Intervening with partners and developing effective coping strategies may decrease risk among HIV-positive men and women. Indeed, effective HIV prevention interventions must consider the social, psychological and cultural context in which sexual risk behavior occurs and develop strategies that intervene on these psychosocial factors.