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Different From Conception
From early in infancy, girl brains are more interested in smiling, communicating, people and security; while boy brains are more interested in objects, actions and competition. With higher levels of testosterone, the male areas of the brain are more developed, including the parietal lobes responsible for sense of direction, visualizing objects in three dimensions (good for catching a football), and mathematics. Without testosterone, the language centers of the brain are more developed, which is why girls like to talk and boys like to play catch. In addition, testosterone beefs up the area of the brain that is interested in sex. This ares is twice as large in men as women. He really is more interested in sex.