Hi all, I've been with my wife for the last 7 years, married for 2 of those. If your SO has a problem with your "gaming", the problem might be one of perspective.
I do not belive in engaging in the following, nor would I advise anyone else too either. That said, there are men out there who cheat on thier wives. They are men that go blow the paycheck at a nudy bar. There are violent and abisive men out there. There are men that verbally destroy their wives. There are men that steal from and leech off of their wives. I am a man that stays home and does not enegae in the above mentioned behavior. See? Life could be much worse for them.
Next "gaming". When I am at my computer I am not simply gaming. I am egageing in a varity of activities. Sometimes when I game, I am spending time with my RL firends and family. We could go out drinking or womanizing but we chose to game instead. Then there are the times I am gaming with work friends. This is more about networking and work relationships instead of spending time with my other friends and so needs it's own group. Then there are the times I am gaming with Guildies and other on-line friends. Lastly there are the times when I am just soloing.
Now, with the above in mind, you should be able to win your SO over to your way of thinking. But just remember the SO comes first, always. If you forget that then nothing can help you.