Sex is a theoretical puzzle because it is much older than we are. A primary fact of biology, sex has defined society from nearly the beginning of life on earth, and as a result we cannot see its effects in our lives in evolutionary comparisons with near primate or mammalian relatives. Sex is a puzzle, too, because it is often misconstrued in social science. It is not, as many social scientists believe, a mere feature of a person, like hair or ...
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