These are that only a man can impregnate a woman (although to do this sexual intercourse is not essential, as in the case of artificial insemination of a woman with a donor’s semen). Only a woman can carry the growing foetus in her uterus and give birth to it, and provide it with breast milk once it is born.
Beyond these biological imperatives the sex hormones impart no more than a ‘flavour’ to a person’s behaviour. Almost all of the way the two sexes behave is learned by observing ‘models’ in infancy, childhood, and adolescence. This implies that most (or all) differences in behaviour of the two sexes are learned.
In this time of rapid social change, and of more open discussion about the relations between the sexes and about sexual roles, society has two choices.
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