In humans, the profound biological differences that exist between the sexes mean that a single male is physically capable of having far more children than is a single female. Women carry unborn children for nine months and often nurse them for several years prior to having additional children.13 Men, meanwhile, are able to procreate while investing far less time in the bearing and early rearing of each child, a biological difference whose effects are amplified by social factors such as the fact that in many societies, men are expected to spend little time with their children. So it is that, as
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