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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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Most of us have been raised with pretty simplistic ideas about sex and gender. Namely, that there are two sexes, male and female, and that they align with two genders, man and woman. But with the increased visibility of transgender, gender non-conforming, and nonbinary folks, many people are beginning to understand that the categories of sex and gender are far more complicated.

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