Sexual activity among adolescents.
D000293:Adolescent; D000294:Adolescent Behavior; D000328:Adult; D044383:Black People; D002648:Child; D005190:Family; D005260:Female; D006801:Humans; D008572:Menarche; D012067:Religion; D012106:Research; D012725:Sexual Behavior; D012959:Socioeconomic Factors; D014481:United States; D001741:Black or African American