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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.     
Overall, the overwhelming data and information shows that a good natural test booster will provide incredibly positive and wonderful benefits without any negative side effects . If you look hard enough, you may find a corner case here or there of something minor or annoying, but we haven’t seen them on any consistent type basis and definitely nothing like some of things you may be hearing with testosterone replacement therapies like AndroGel (which is NOT a Test booster….but rather a outside injection of testosterone).That’s because with natural Test boosters, you’re not injecting your body with outside ’re taking natural supplements that trigger and cause your own body to produce more of it’s own testosterone – naturally!