An overwhelming majority of all violence in society is committed by men - whether it takes place in homes, on the streets, in wars, sports arenas or in politics. In order to understand violence, therefore, we need to begin our understanding of what it means to be "a man". What happens when men in power position dismiss sexual harassments as "locker room talk"? Why is it mostly women who are speaking out against violence? What role does masculinity play in the growing right-wing extremism globally? And how do porn and popular culture affect our beliefs about men, women and violence?