This study examines sexual risk behaviors among 197 women mandated to substance abuse treatment in therapeutic communities. The women's risk behaviors after treatment are compared with their behaviors prior to treatment, and risk behaviors among those who completed treatment are compared with those who did not. The women had a high prevalence of sexual risk behaviors (i.e., multiple partners, unprotected sex, sex trade, not asking partners to use condoms, sex with injection drug users [IDUs]) and relationship violence and conflict before treatment and a significant decrease in unprotected sex, sex trade, sex with multiple partners, and relationship violence or conflict after treatment. Those who completed treatment were significantly less likely to participate in sex trade or have sex with IDUs and were more likely to have a new sexual partner and only one sexual partner after treatment as compared with those who did not complete treatment. The present study shows that therapeutic community treatment is associated with the reduction of sexual risk behaviors among female substance abusers mandated to treatment.