I thought this was a given. Testosterone levels are higher in males. The judgement centers of the brain do not fully develop until age 25. What is so hard to understand? That is why traditionaly, young men are harnessed to the military - their hormones make them naturally agressive and they can follow orders without questioning.
Remember the bullshit from the 90's when college freshmen men had to sit with evil looking feminazis and listen to themselves being told they were "all potential rapists?"
Some poor saps even believed it.