Teenagers swap pill for condom.
D000163:Acquired Immunodeficiency Syndrome / Q000517:prevention & control; D000293:Adolescent; D000328:Adult; D017280:Condoms / Q000706:statistics & numerical data* / Q000639:trends; D003267:Contraception / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male