Evolutionary psychologists also have an answer for why humans commit to one another , this they believe stems from the development of the human infants brain which was constrained during the time spent in the mother's womb due to shape of the pelvic girdle of the now upright human, this meant that the brain carried on developing long after its birth and so depended on the parents longer, because of this a greater commitment was needed from the father and so would be another trait looked for in a potential male. ... Psychoanalytic perspective focus on how we make sense of sexual difference...

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• Grade Level: Graduate