title: [Premarital sexual activity in cities].
mesh_terms: D000293:Adolescent; D000328:Adult; D003075:Coitus; D003604:Czechoslovakia; D005260:Female; D006801:Humans; D008297:Male; D008393:Marriage; D014505:Urban Population
vernacular_title: Predmanzelská pohlavní aktivita ve mĕstech.