Empirical research shows increases in male hunting are most reliably associated with increased familial requirements as the number and needs of dependent children increases and the productivity of a wife decreases as a consequence of pregnancy, lactation, and childcare. Changes in male hunting are most consistently viewed as paternal effort.
CITATION STYLE
Levin, R. (2016). Penile-Vaginal Sex. In Encyclopedia of Evolutionary Psychological Science (pp. 1–4). Springer International Publishing. https://doi.org/10.1007/978-3-319-16999-6_3365-1
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