I love when my girlfriend plays games with me but it usually ends badly for both of us. It goes something like this...
Co-op in Gears of War: We enter the game and I'll tell her what is going on like, "Ok, there is some bad guys up here.. get ready" and she'll say, "What the fuck?! I don't even know what I'm looking at.. these fucking controls are so stupid.. where did you go? WHO IS SHOOTING ME?! WHERE AM I BEING SHOT FROM?!" Then I'll try to tell her to stop spinning wildly and looking at the sky and just slowly move the camera around so she understands the surroundings to which she'll reply, "IM NOT EVEN TOUCHING THE CONTROLS! THIS IS SO STUPID I HATE MYSELF!" at which point she leaves the room.
Vs in anything: We enter the game and she starts looking for me. I instantly know where she is because I have the whole map memorized. I pretend to be looking for her but I'm really just watching her so I know where she is. I orchestrate a meeting where she is behind me or something where it looks like I don't see her. Then she starts shooting at me and missing and I pretend like I don't know where it's coming from for awhile.
Then finally she is out of ammo and probably running into a wall or stuck somewhere. At this point I have to start shooting back and pretending like I'm trying because she knows I'm not that bad. She'll say something like, "Oh come on.. I know you're not even trying.." and I'll say "I am.. seriously.. this is so hard."
Then about 9/10 times I kill her even though I've been trying as hard as I can not to or occasionally she'll be able to kill me if I walk backwards into her saying, "Oh my god.. where are you?"
After about 10-15 minutes of this I get really bored and decide to start playing for real. I'll just pull out a knife or whatever and side-step/crouch/jump over to her and kill her over and over again until she says, "WHAT THE FUCK! YOU'RE OBVIOUSLY BETTER THAN ME! WHY DON'T YOU EVEN LET ME WIN EVER?! I FUCKING HATE THIS GAME! THESE CONTROLS ARE STUPID! I AM WORTHLESS AND HATE MYSELF!"
So, do I appreciate it when she joins me playing games? Yes, I really love it that she is willing to traumatize her ego by playing a video game with me. Even after countless thrown controllers and emotional fights with me she'll still come and play if I ask her to. And you know just recently I got her playing Portal from the Orange Box thing and she can actually maneuver using a mouse/keyboard in a 3D environment without spinning in circles or staring at the floor. This is a huge improvement. I think in another 5 years or so she might be able to play co-op with me without crying at the end.
Oh and as far as discrimination against female gamers goes.. the only thing I've ever noticed is if a girl talks in voice chat everyone says, "WHOA ITS A FEMALE!"