Testosterone is significantly correlated with aggression and competitive behaviour and is directly facilitated by the latter. There are two theories on the role of testosterone in aggression and competition.  The first one is the challenge hypothesis which states that testosterone would increase during puberty thus facilitating reproductive and competitive behaviour which would include aggression.  Thus it is the challenge of competition among males of the species that facilitates aggression and violence.  Studies conducted have found direct correlation between testosterone and dominance especially among the most violent criminals in prison who had the highest testosterone levels.  The same research also found fathers (those outside competitive environments) had the lowest testosterone levels compared to other males. 
A big problem when using Testosterone Enanthate in bodybuilding is its strong ability to aromatisation, . estrogen conversion. As a result, athletes ofther get gynecomastia, edema, fat deposition on the female type, etc. Today the drugs for the control like estradiol remove side effects of aromatase inhibitors. The use of antiestrogens is more appropriate and even necessary after Test E cycle, primarily to normalize the natural production of endogenous testosterone. Testosterone Enanthate just like any other anabolic steroids for sale has a vast influence on the arc “hypothalamus – pituitary – testes”. As a result, the function of the pituitary gland by a feedback mechanism is inhibited, which is manifested by decreased secretion of endogenous testosterone.