Somewhere around puberty, everyone spent a good chunk of their life listening to some adult teach about the wonders of the human body. The physical differences are obvious: males tend to have more facial hair, females are generally shorter and have more delicate facial features. The subtle differences are harder to catch, but still noticeable. Males tend to be louder and more aggressive while females are more emotional. Psychologically, there is a dichotomy between behaviors that men versus women exhibit, and researchers may have found a reason why.