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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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Health Facts.

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Many young people engage in sexual risk behaviors and experiences that can result in unintended health outcomes. Sexual risk behaviors place youth at risk for HIV infectionother sexually transmitted diseases STDsand unintended pregnancy :. Half of the 20 million new STDs reported each year were among young people aged 15 to 24 3. Nearlybabies were born to teen girls aged 15—19 years in

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