<i>Background/Objectives</i>: It is unknown whether impulsivity is associated with risky sexual behavior in dually diagnosed clients. <i>Methods</i>: Impulsivity in 51 sexually-active, dually diagnosed clients was assessed by the Barrett Impulsivity Scale, Delayed Discounting Questionnaire, and Wisconsin Card-Sorting Task, and a path analysis of relationship to self-reported risk behaviors was conducted. <i>Results</i>: Recent cocaine use was correlated with risky sexual behaviors and a preference for immediate over larger, delayed rewards trended towards a correlation. <i>Conclusion and Scientific Significance</i>: The association between impulsivity and risky sexual behavior among substance users appears to extend to the dually diagnosed. Implications for HIV prevention are discussed.