Project Goal: The project studied Latino and African American adolescents, their parents and their romantic partners, in order to gain a better understanding of the relevant dynamics surrounding adolescent sexual risk behavior. The aim of the research was to gain insight into the bases of adolescent sexual risk behavior by taking into account the family contexts and the couple contexts that affect sexual risk behavior. This knowledge can be used to inform the design of parent-based prevention interventions to address risk behavior, as well as other forms of intervention, such as school-based programs.