the simple answer as to why more men play guitar and generally play faster is a simple one. a guitar is just a dick extension
ask carlos santana, i quote "There are four things that should go into all guitar playing, The Heart, The Mind, The Soul and The Dick"
its not strictlly true since there is always a metal girlband scene, try over in japan. "Yellow Machinegun" Comes highlly recommended by a friend of mine if you dig the whole girl metal thing