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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.     
5) Progesterone . Hey, men need progesterone too - or at least they need adequate levels. See this link on Progesterone and Men , but progesterone can help men out in many key areas and one of them is bone mass. I see very differing opinions on just how to raise progesterone. Some experts say you should "backfill" using pregnenalone. Others say that generally is ineffective. Some say most middle-aged men need some progesterone and there is now an evidence that Progesterone Can Help with Erectile Dysfunction . Still other experts say that progesterone is "estrogenic" and fights against "maleness" and should rarely if ever be given. Nevertheless, I post it here, because it is an interesting solutions.