title: Semen and AIDS.
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000276:immunology*; D005260:Female; D006801:Humans; D007108:Immune Tolerance; D008297:Male; D012007:Rectum / Q000033:anatomy & histology; D012661:Semen / Q000276:immunology*; D012725:Sexual Behavior; D014621:Vagina / Q000033:anatomy & histology