Testosterone propionate is just an injectable form of male androgen testosterone. Added propionate ester will reduce the rate of tempo in which the testosterone is carried out from the vaccination spot, but it happens for a short period of time. Testosterone propionate is considered to be much faster acting product as compared to any other testosterone esters that are cypionate and enanthate, and it requires more frequent schedule of dosing. Mostly testosterone is considered as the much older and underdone form of testosterone that can be injected. Since it is an injectable testosterone, this testosterone is considered as the most effective drug that can help in building mass and also helps in gaining muscles size and force quickly.
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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.