Although seroprevalence studies have shown that Thai male sex workers are at heightened risk of HIV infection, no sustained preventive strategies have so far targeted homosexually active men in Thailand. In this paper, we bring together data from qualitative research carried out in Pattaya Sittitrai 1995, 1997) and Bangkok (Storer 1999a(Storer , 1999b, with data generated during a bar-based intervention in Bangkok (Carl, unpublished report), to develop a taxonomy of sites in which the recruitment of male commercial sex can occur. We also examine the sexual networks of Thai male sex workers and their clients in order to demonstrate the overlap of commercial and non-commercial male-male sex sites, and the intersection of male commercial sex with heterosexual sex. Previous interventions directed towards Thai male sex workers been non-continuous; largely restricted to high-pro®le tourist areas, have not acknowledged the importance of recreational sex; and have not built up a capacity for ongoing intervention. With a change of focus, interventions directed towards sex workers could reduce the risks of HIV infection among both organized and freelance sex workers as well as their commercial and male and female casual sex partners. First, however, there needs to be a commitment to well planned and long range interventions directed by and at male sex workers.