Promote condom use for all sexual relationships.
D000163:Acquired Immunodeficiency Syndrome / Q000453:epidemiology* / Q000517:prevention & control / Q000635:transmission; D017280:Condoms; D005260:Female; D015528:HIV Seroprevalence; D015497:HIV-1; D006801:Humans; D008131:London / Q000453:epidemiology; D008297:Male; D012307:Risk Factors; D011477:Sex Work; D012725:Sexual Behavior; D012749:Sexually Transmitted Diseases / Q000453:epidemiology / Q000517:prevention & control / Q000635:transmission