Behavioral Intervention to Reduce Sexual and Injection Risks Among Female Sex Workers Who Also Inject Drugs in Mexico

The investigators propose a highly efficient four-arm (factorial) trial to simultaneously test the efficacy of two behavioral interventions aimed at: * increasing condom use in the context of ongoing drug use and * decreasing needle and paraphernalia sharing among female sex workers who also inject drugs in two Mexican-U.S. border cities: Tijuana and Ciudad Juarez.