Abstinence pledges not effective.
D000293:Adolescent; D000294:Adolescent Behavior / Q000523:psychology; D001294:Attitude to Health; D005260:Female; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D007629:Kentucky; D008297:Male; D000297:Psychology, Adolescent / Q000706:statistics & numerical data; D012746:Sexual Abstinence / Q000523:psychology / Q000706:statistics & numerical data; D012725:Sexual Behavior / Q000523:psychology / Q000706:statistics & numerical data; D012749:Sexually Transmitted Diseases / Q000517:prevention & control / Q000635:transmission