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Reasons for the rise in teenage illegitimacy are discussed. In the past relatively poor health conditions may have moderated the consequences of nonmarital teen-age sex. Improved health conditions appear to have increased the chances that an out-of-wedlock conception will be carried to term and have also increased the capacity of sexually active young girls to conceive. The myth of an abstinent past and a promiscuous present is indeed a myth. Aside from substantial increases in premarital sex among young whites there is no evidence that a change in nonmarital sex of revolutionary proportions has occurred since 1940 among either white or nonwhite teenagers.
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Phillips Cutright (1972) studied this question.
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