Male sex workers (MSW) who sell/exchange sex for money or goods comprise an extremely diverse population across and within countries worldwide. Information characterizing their practices, contexts where they live, and their needs is very limited, as these men are generally included as subsets of larger studies focused on gay men and other men who have sex with men (MSM) or even female sex workers. There is growing evidence of a sustained or increasing burden of HIV among some MSW. Shinners will tackle the biological, behavioral, and structural determinants in relation to MSW in this session.