We developed and tested a multifaceted model of condom use intentions with cross-sectional data from 435 heterosexual women at risk for HIV/STIs. In addition to traditional intrapersonal variables drawn from established models of HIV prevention (e.g. attitudes, norms, self-efficacy), the present study examined the role of relationship factors and dynamics (i.e. relationship commitment, duration, condom use and pregnancy prevention decision-making) in shaping condom use intentions. In some cases, relationship variables were directly associated with condom use intentions. In other cases their effects on condom use intentions were mediated by intrapersonal constructs. The final model accounted for 66% of the variance in condom use intentions and confirmed the importance of integrating intrapersonal variables and relationship characteristics and dynamics in understanding women's intentions to use condoms. These results offer important insights for the design of interventions directed at promoting condom use among young women at risk for HIV/STIs and underscore the need to design prevention programs that address relationship characteristics and dynamics.