Describes the distinguishing sexual characteristics of an organism, generally as male or female. Characteristics include physical, chemical, psychological, which were thought to evolve for maximum survival of the individual and the species.
This can vary greatly between individuals, and an individual can have characteristics of both groups, or neither. In these cases, the individual sometimes chooses to identify with a particular gender group.
http://bravetheworld.com/2016/08/09/50-real-differences-men-women/
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