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.     
Although it’s a newer product, we actually found quite a few reviews for Alpha Testosterone Booster. We’re thinking there are so many because of the amazing, yet exclusive trial the manufacturers are currently offering. But, more on that below. Most customers experienced a range of benefits within just the first week. Many claimed having more energy and motivation to work out and stay healthy. While others focused more on the sexual benefits, saying they lasted as long as their partner needed in the bedroom. Some others noticed longer-lasting and bigger erections even. All in all, we’re very excited for this product, because it is already changing many men’s lives.