Games to play with non-gaming girl (60+ GAs inside)

Cod 3, borderlands 2, css go. Oh btw joined group but need also to be part of whitelist to join them.

You could play "hide the stick"...

My first recommendation would be Trine or Torchlight 2.
Perhaps Lovers In a Dangerous Spacetime? I've never played it, but it looks good.

Rampage Knights, Castle Crashers, Town of Salem, Battleblock Theater, Kwaan for example :)

McDroid's pretty fun. Should be MAC compatible, never tried the mult/coop option for it though.

To the Moon. It's single player, but it's simple gameplay-wise, though it has good interesting dialogues, good story and is rather atmospheric.

I joined, thanks for the chance

As others have already suggested, Trine games are very nice to play together.

In my experience, theme is something very important, when introducing new people to games. If you can find a game with a theme she really enjoys, she's far more likely to enter with an open mind.

Also, Worms.

I'd recommend the Trine games too, played the second with my gf and she really enjoyed it.
Other games I'd recomend would be (since I played them with my gf)
Keep talking and nobody explodes
Tabletop SImulator
Battleblock Theatre
Ibb & Obb
Monaco: What's yours is mine
(of course) Portal 2
and I'm planning on giving Lovers in a dangerous space time a try in the near future

oh yeah and we enjoy playing point&click adventures together (like all the deadalic games out there), perhaps that's something for you guys aswell

like Fnord said: if you can find a theme she likes it'll definitly help getting her into the game

Lego games, brother

Red Rope.

Still in closed testing, sadly :(

i play hidden object games with my fiance its not a traditional co-op game but we play it as a co-op game she decides wwho to solve the riddle me or her and at hidden object screens i start from upper left searching items while she starts from bottom right and its fun she also enjoys assassins creed

Well, one thing I can think of is 100% Orange Juice but it doesn't run natively. It runs perfectly in Wine on Linux, maybe a similar thing for OSx?

Sex, it's a nice fucking co-op.