It's interesting watching the conversation over sex differences take shape. On the one hand, we have a group of people that say even though males and females are biologically different there are NO differences in the way we think or perform. At the other extreme you have the "girls are nurturing, males are war-like" argument. What it really is is a combination of both nature and nurture. The effects of testosterone and estrogen are well known. Brain plasticity is a marvelous thing. Add to that 'developmental windows' where certain behaviors and predilections become our (as in each individual person's) baseline behavior and you have a fantastic spectrum of humanity. Average people will tend more toward stereotypical behavior, because the stereotypes define average. Those at either end of the spectrum may be a hyper stereotype or a stereotype defying unique one-of-a-kind individual. Don't hate it, embrace it.
I found the below links a week ago, just browsing for 'sex differences':
http://www.psychologytoday.com/blog/the-how-and-why-sex-diff...
http://sugarandslugs.wordpress.com/2011/02/13/sex-difference...