It is also only in humans that aggression may be used to commit crimes, to enslave others or compel acquiescence to religious or ideological doctrine, or to pursue wars of national interest. At the individual level, men are universally more aggressive than women, and rates of aggressive confrontation are greatest among those who are young, poor, or unmarried. Cultural factors moderate human aggression as well, with men's heightened sensitivity to signs of disrespect, challenge, or threat spawning a high frequency of confrontational violence in so-called “cultures of honor”.
Randy J. Nelson, Biology of Aggression
biology, science