Editing Aggression (section)

==== Physiological factors ====
Regarding sexual dimorphism, humans fall into an intermediate group with moderate sex differences in body size but relatively large [[testes]]. This is a typical pattern of primates where several males and females live together in a group and the male faces an intermediate number of challenges from other males compared to exclusive [[polygyny]] and [[monogamy]] but frequent [[sperm competition]].<ref name=Oxford2007>{{cite book |doi=10.1093/oxfordhb/9780198568308.013.0030 |year=2012 |last1=Low |first1=Bobbi S. |chapter=Ecological and socio-cultural impacts on mating and marriage systems |chapter-url={{Google books|8K7Hc09xcQAC|page=449|plainurl=yes}} |pages=449–62 |editor1-first=Louise |editor1-last=Barrett |editor2-first=Robin |editor2-last=Dunbar |title=Oxford Handbook of Evolutionary Psychology |isbn=978-0-19-856830-8 }}</ref>

[[Evolutionary psychology]] and [[sociobiology]] have also discussed and produced theories for some specific forms of male aggression such as [[sociobiological theories of rape]] and theories regarding the [[Cinderella effect]]. Another evolutionary theory explaining gender differences in aggression is the [[Male Warrior hypothesis]], which explains that males have psychologically evolved for intergroup aggression in order to gain access to mates, resources, territory and status.<ref name=":1" /><ref name=":2" />