Eh, if you were into heavy bodybuilding, American football, car mechanics or guns, maybe an explanation would be nice (even though ultimately gender stereotypes are bad and blah blah, but that's not the poin here), but video games and metal, seriously, no. Those are only somewhat more masculine interests statistically. Video games were a lot of a male thing maybe 5-10 ago, but not anymore. For example, in Dragon Nest, there's, what, 1/3 girls? And people are just not surprised that people are girls anymore, because there's only a small majority of guys on most games now. Well, if we're talking about first-person shooters and such, maybe, but even then! I'm convinced there's at the very least 15 % girls there too!