title: Number of sex partners and potential risk of sexual exposure to human immunodeficiency virus.
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D006679:HIV Seropositivity / Q000635:transmission*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011159:Population Surveillance; D012307:Risk Factors; D012747:Sexual Partners; D013997:Time Factors; D006113:United Kingdom; D014481:United States