here is something i found somewhere online that i copied a while ago.
Simple. Its called testosterone. Its kind of amazing how much stronger men are. My partner used to teach a self defense course, and its really a disservice to women for all these crazy shows and books to confuse them into thinking that they have any sort of a chance against a healthy male. Even if a woman is well trained around 60 percent of the men her age are capable of laying her flat. For an average woman its much, much worse.
check out my site, www.jaggedlittledyl.com
, unless you're there now