accepted Accumulative Incidence Active Incidence actually adolescent adult age groups American animal appear average Background become BIRTH born calculations capacity Catholic cent Chapter codes coital considerable considered contacts correlations culture decade depend devout differences dreams early EDUCATIONAL LEVEL effect engaged erotic experience extra-marital fact factors females and males Figure frequencies genitalia girls heterosexual higher histories homes homosexual human importance increase indicate individuals instances interests involved Jewish less limited lower males marital coitus marriage married females masturbation means median Moderate Inactive never nocturnal observed occurred older particular Percent Percentage period persons petting physical play possible pre-adolescent pre-marital coitus present previously Protestant psychologic reached orgasm record relation relationships religious reported responses sexual activity significant single social sort specific stimulation Table techniques tion total outlet total sample volume week younger