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.     
In a recent study researchers found “RESULTS: Testosterone, LH and FSH were significantly increased at the high dose of 7-methoxy-8-(3-methyl-2-butenyl)-2H-1-benzopyran-2-one treatment. The high and low dose of 7-methoxy-8-(3-methyl-2-butenyl)-2H-1-benzopyran-2-one treatment significantly enhanced the activity of NOS (P < ). CONCLUSION: 7-methoxy-8-(3-methyl-2-butenyl)-2H-1-benzopyran-2-one could increase androgen, gonadotropin and nitric oxide synthase (NOS) activity. It suggested that 7-methoxy-8-(3-methyl-2-butenyl)-2H-1-benzopyran-2-one had androgen-like effect and gonadotropin-like effect.” OSTA-PLEX® is the most advanced muscle building agent on the market today. The pSARM effect in OSTA-PLEX® along with the 19-NorDhea and advanced delivery matrix give OSTA-PLEX® the anabolic punch to build muscle! There has never been anything like OSTA-PLEX® for increasing size and strength!