Based on my experiences with my friends (I'm a girl, they be girls, everyone plays), there's no inherent skill difference, just game preferences and different playing styles. Most of the girls I know are more 'co-op' based, rather than competing online. Also, the girls I know have a LOT more variety in their games. We're just as likely to sit down with an old-school RPG as a modern shooter. It may seem, to the random guy I run into online, that I don't play much- my trophies/gamescore are on the low side. It's not true- it's a side effect of spreading my gaming across the 10 systems hooked up to my TV right now. (Plus the handhelds...) Every girl gamer I know has at least 3 systems of varying ages, and at least 1 handheld. Well, all but one- she's pretty WoW exclusive these days. (It worries us a bit...)