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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Hypogonadism occurs when the male sex gland (gonadal, testes are the gonads) is absent or is not sufficient. When this happens, secretion of testosterone is less, hence low testosterone. There are two types of hypogonadism – primary and secondary. Testicular failure is the cause of primary hypogonadism. Secondary hypogonadism occurs due to dysfunction of the hypothalamus -pituitary axis. Both conditions lead to the release of low testosterone. Therefore, body functions relying on testosterone begin to suffer. A combination of the two can result to hypogonadism. The cause of low testosterone is as below: