arousal theory
people seek to maintain a preffered level of arousal, but very in how they process sensory input. A need for high levels of environmental stimulation may lead to aggressive, violent behavior patterns.
Cheater theory
a subpopulation of men has evolved with genes that incline them toward extremely low parental involvement. Sexually aggressive, they use deceit for sexual conquest of as many females as possible.
Social learning theory
people learn to be aggressive by observing others