Girls just have other things to do in the realm of real world things, boys really only have some various sports that need more than one person to play. Also, girls are a lot more social and emotionally connected to they're friends then men. That's why you see many more boys playing video games than girls
Guys there is no question about it. Have you ever been to a college dorm? Literally every room I walk by either has Madden on, League of Legends, or Call of Duty. I walk through girls floors and I almost never see any video games being played.