 Study subjects will be recruited in a variety of ways. In Santo Domingo, fliers will be posted in bars and night clubs frequented by men at high risk for HIVSTI acquisition. A group of volunteer commercial sex workers working on an HIV vaccine trial will be asked to refer their clients for the study. Men seeking care for STI at the clinic will also be invited to participate. In La Romana, men attending the Clínica de Familia will be invited to participate. In addition, a group of outreach workers will visit the bateyes, the communities surrounding sugar cane fields where migrant laborers live, to educate men about MC and invite them to participate in the study. 