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.     
Esterified anabolic steroids are more fat soluble, and release slowly from the injection site – trenbolone enanthate cycle however, this is not the main mast and test prop cycle reason as to why esters extend the release rate of the anabolic steroid. Corticosteroids or Corticotropin (testosterone may contribute to the edema test prop before workout that test cypionate trenbolone enanthate can occur with administration of corticotropin or corticosteroids; caution is recommended during concomitant administration in patients who have special risks, test prop before workout such as patients who have cardiac or hepatic primo prop cycle disease.