The second theory is similar and is known as "evolutionary neuroandrogenic (ENA) theory of male aggression".   Testosterone and other androgens have evolved to masculinize a brain in order to be competitive even to the point of risking harm to the person and others. By doing so, individuals with masculinized brains as a result of pre-natal and adult life testosterone and androgens enhance their resource acquiring abilities in order to survive, attract and copulate with mates as much as possible.  The masculinization of the brain is not just mediated by testosterone levels at the adult stage, but also testosterone exposure in the womb as a fetus. Higher pre-natal testosterone indicated by a low digit ratio as well as adult testosterone levels increased risk of fouls or aggression among male players in a soccer game.  Studies have also found higher pre-natal testosterone or lower digit ratio to be correlated with higher aggression in males.     
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Do you suffer from any of these symptoms? Taking certain medications will also lower your testosterone levels. All it takes is one blood test in our clinic to determine whether or not your hormones are insufficient . Your bloodwork is covered by insurance with no co pay, or if you chose to pay cash, the cost is $ for females and $ for males. This lab test for females includes total testosterone Estradiol, follicle stimulating hormone, progesterone, Thyroid stimulating hormone, free T-3 , thyroid antibodies and Complete blood count . For males, we will need total testosterone, prolactin, thyroid stimulating hormone, free T-3 , thyroid antibodies, PSA, and complete blood count.