1. Who is sexually active? Using a multi-component sexual activity profile (MSAP) to explore, identify and describe sexually-active high-school students in rural KwaZulu-Natal, South Africa Humphries, Hilton; Osman, Farzana; Knight, Lucia; Abdool Karim, Quarraisha 2019 Articles SexHigh school students--Sexual behaviorSexually transmitted diseasesPublic healthDemography