VideoGameWriters.Com has a decent article about how to get your significant other to play video games with you. Since I know that about 60% of our readership is male, I’ll just assume for the moment (and this moment only), that is what you are.
Basically, the idea is to get them started the same way you did: on something lite, easy, and slowly build up to games with more complex mechanics and control schemes and so on and so forth. If you’ve ever played any of Blizzard’s games, you know that even something as seemingly complicated like an MMO is made simple and intuitive for even the newest of gamers. Their approach is simple: learn one mechanic at a time, exercise it to reinforce it, and then introduce a new mechanic. The same must be done with the games you play with your girl.
Another pro-tip is to play co-op games (unless your girl is more competitive than you are) so that you the pressure to win is only as high as the game’s computer AI makes it (which should be set to “easy”, by the way). WTFBBQPWNing your girlfriend is a sure way to not get to do any late night “role playing” yourself.
Even if you are playing co-op, you have to make sure you aren’t out-performing her [by too much], so that she doesn’t feel like she isn’t contributing to the achievement of advancement. I made that mistake by letting her play Super Mario World and attempt a level, but if she died, I would immediately come through a beat the stage for her. Needless to say, despite not beating stages on her own, she got bored because she wasn’t advancing – I was.
Another strategy to gain an entry point into video games is to simply play games that are entertaining to watch, or that they can passively participate in. One example is Braid. Not only are the images and music engaging, but when I played this with my girlfriend watching, she and I talked through the puzzles together and I did running and jumping for Tim. We even discussed our interpretations of the ending together.
I am eagerly anticipating the release of Diablo III, and I am hoping to see that she picks up the control schemes relatively well so that she and I can play together. Of all co-op games that you could introduce a girl to, what could be simpler than a point and click type of co-op game where you mutually work towards the same goals at the same time?