title: An urgent warning--contraction of HIV infection during mutual masturbation.
authors: G J
authors: GJ
authors: Knobel
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000635:transmission*; D000328:Adult; D006716:Homosexuality; D006801:Humans; D008297:Male; D008418:Masturbation; D012661:Semen / Q000382:microbiology*