 The second theory is also similar and is known as the evolutionary neuroandrogenic (ENA) theory of male aggression.Testosterone and other androgens have evolved to masculinize a brain in order to be competitive even as far as being a risk to harming 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.