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NCBI Bookshelf. The initiation of sexual intercourse is an important topic in the study and prediction of fertility. In their theoretical analysis of fertility and its determinants, Davis and Blake argued that socioeconomic and other factors affect fertility only through its proximate determinants, that is, through exposure to sexual intercourse, exposure to conception, given intercourse, and gestation and successful parturition, given conception.

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Teenagers and young adults are engaging in a wider variety of sexual practices than they did 20 years ago, according to a new study in the Journal of Adolescent Health. The researchers analyzed more than 45, interviews from three surveys of British residents ages 16 to 24, conducted every decade. The people interviewed in the first survey were born in the s, while those in the most recent survey were born between in the s.

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