Young men go for violence because - in the absence of showing off their ability as provider - fight for an alpha male position via force (I will look up references if needed).
Could I have the reference, please ? Very curious about the experimental set-up.
The best I could find quickly online. Not really experimental setups though.
Competitiveness, risk taking, and violence: the young male syndrome: http://www.sciencedirect.com/science/article/pii/016230958590041X
hunter gatherer fighting: http://www.jstor.org/discover/10.2307/3317472?uid=3737864&uid=2&uid=4&sid=21103219067527
TESTOSTERONE AND DOMINANCE IN MEN: http://cogprints.org/663/1/bbs_mazur.html
Dalrock writes an interesting article related to Dr. Helen Smith's book the Marriage Strike. I really have to bump it up on my too rapidly growing reading list. (^_^)