The Men’s Atlanta Networks Project (The MAN Project) was a cross-sectional chain-link study of the sexual networks of black and white non-Hispanic MSM that sought to help understand how HIV and sexually transmitted infections (STIs) spread in MSM communities, and why black men are at more risk. MSM were recruited from venues throughout Atlanta and others were referred into the study as sex partners of participants. Participants were required to complete a detailed computer-based questionnaire and to receive HIV counseling and testing, and STI testing. This initiative was funded by the National Institutes of Health (NIH).