At what age are South African women first having sex?
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D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000367:Age Factors; D003075:Coitus; D003267:Contraception / Q000379:methods / Q000706:statistics & numerical data; D005260:Female; D007722:Health Knowledge, Attitudes, Practice; D006306:Health Surveys; D006801:Humans; D008875:Middle Aged; D013019:South Africa