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This article examines sexual risk taking among self-identified bisexual men in San Francisco and whether risk reduction has occurred, with respect to both homosexual and heterosexual behaviors, among human immunodeficiency virus (HIV) antibody-positive and HIV antibody-negative men. It also examines psychosocial correlates of unprotected anal and vaginal intercourse.

Are bisexually identified men in San Francisco a common vector for spreading HIV infection to women?