Masculinity...

In class we had been discussing how masculinity is being fueled negatively by the culture. In our discussions the example that most stuck out in my mind is the fact that GI Joe action figure's biceps getting disproportionately bigger by the decade. We discussed that it's the societal pressures (through toys, advertisements, how we treat boys when they're young, etc.) we put on men to act strong and be strong but another side of this picture just occurred to me. Several chapters into this book I am reading, I was stunned as to how applicable it is to the discussions we have been having in class. This book is called, "Wild at Heart,"discusses how theoretically the roles of men and women go all the way back to the creation of earth. "Adventure, with all its requisite danger and wildness, is a deeply spiritual longing written into the soul of man..."what I have read so far has gotten me to think more deeply about the roles of men and women in society and the effect those roles must have. Back in history as far back as you can go men were the hunters and women were the gatherers...How do we know that masculinity is not just purely genetic and the lack of constructive outlet now-a-days is the cause of violence? What if these masculine traits are natural and the contradiction of the naturalness of these traits vs. the necessity to be domesticated and stuck indoors is causing the violence? Think: If you domesticated a tiger through generations and generations would the need to hunt and be aggressive vanish? Is this any different than humans?