Sexual behavior of unmarried university students in 1968 and 1972.
D003075:Coitus; D005260:Female; D006801:Humans; D008297:Male; D008393:Marriage; D012737:Sex Factors; D012725:Sexual Behavior; D013334:Students; D011795:Surveys and Questionnaires; D013997:Time Factors; D044465:White People