Homosexually transmitted infections.
D004739:England; D006069:Gonorrhea / Q000635:transmission; D006509:Hepatitis B / Q000635:transmission; D006716:Homosexuality; D006801:Humans; D008297:Male; D012749:Sexually Transmitted Diseases / Q000453:epidemiology / Q000635:transmission*; D013587:Syphilis / Q000635:transmission