This study examined the utility of cognitive and behavioral constructs (AIDS information, motivation, and behavioral skills) in explaining sexual risk taking among 172 12-20-year-old ethnically diverse urban youths in outpatient psychiatric care. Structural equation modeling revealed only moderate support for the model, explaining low to moderate levels of variance in global sexual risk taking. The amount of explained variance improved when age was included as a predictor in the model. Findings shed light on the contribution of AIDS information, motivation, and behavioral skills to risky sexual behavior among teens receiving outpatient psychiatric care. Results suggest that cognitive and behavioral factors alone may not explain sexual risk taking among teens whose cognitive and emotional deficits (e.g., impaired judgment, poor reality testing, affect dysregulation) interfere with HIV preventive behavior. The most powerful explanatory model will likely include a combination of cognitive, behavioral, developmental, social (e.g., family), and personal (e.g., psychopathology) risk mechanisms. form across youths. Adolescents receiving mental health services are especially vulnerable to HIV because they engage in the same risk behaviors as their school-aged peers but at higher rates (Brown, Danovsky, Lourie, DiClemente, & Ponton, 1997; Donenberg, Emerson, Bryant, Wilson, & Weber-Shifrin, 2001). In a recent study, teens in psychiatric care reported high rates of unprotected sexual intercourse (55 sex while using drugs/alcohol (49%), sex with a high-risk partner (43%), and being currently sexually active (45%) (Donenberg et al., 2001). Cognitive deficits associated with mental health problems, such as impaired decision making, poor judgment, impulsivity, and inaccurate assessment of risk exacerbate the health risks for these youths, but their unique risk mechanisms are not well understood. The current study tested a cognitive-behavioral model of HIV risk among youths in psychiatric care based on the constructs of the information-motivation-behavioral skills (IMB) model (Fisher & Fisher, 1992).