I wouldn't say that it's been an "issue" really. My boyfriend is a pretty hardcore gamer and plays games online with buddies from work (as I type this, he is playing Modern Warfare 3 online - I thank the stars above that he's not talking on his microphone, because that's annoying...), so he can literally be at that for hours - all day if I would let him.
Why I say that it's not really an issue is because normally he's playing his video games and I'm nerding it up on the computer - do whatever it is that I do on the computer... Some nights, yes, he's exhausted himself playing games until 3 in the morning and doesn't want to stay up the extra hour for sex when he's gotta be up at 6:30... But it only becomes an issue if he does it multiple nights in a row and then I just choose that I'm in a Netflix watching mood.