 Although recent meta-analyses of the HIV prevention intervention literature have demonstrated that behavioral interventions reduce sexual risk-taking among men who have sex with men MSM, interventions for not-in-treatment substance using MSM are lacking. Consequently, and based upon overwhelming evidence that substance use is a primary driver of HIV infection among urban MSM, public health authorities have identified the development of efficacious interventions for substance using MSM as a concern of the highest priority. The proposed study aims to test a new intervention based upon psychological empowerment theory that, in preliminary field tests, produced high levels of acceptability and participation, as well as large reductions in sexual risks and substance use, among a sample of ethnically-diverse, high risk, substance using, HIV and -negative MSM. The intervention to be tested is based upon a theory of MSM health risk behaviors that posits that urban gay fast lane subcultures present risk environments - including lack of integration with the larger society, normative hypersexuality and substance use, homophobia, sexual competitiveness, and an emphasis on entertainment and escapism - that become problematic for a sizable minority of MSM who live in them. 