Terraria, sort of a 2D side-scrolling Minecraft, also has multiplayer.
Second Life, it’s as simple as online RPG’s get. You make up your own rules. Or not.
I started out as a puzzle/casual/rpg fan, but here’s some games not in that genre I found to be fun:
Dynasty Warriors / Samurai Warriors / Warriors Orochi - Hack and slash featuring 2-player co-op (I think only Samurai Warriors 3 and Warrior Orochi 3 has on-line co-op, though, everything else requires you to be on the same console), it’s crazy fun and you get to learn stuff about Chinese and Japanese history (filtered through a very distorted lens of adaptations that were then adapted from other adaptations, but still).
Kirby’s Epic Yarn - 2-player (local, unfortunately) Platforming with the occasional wii-mote gimmick. You don’t ever actually die, but instead lose beads, which dings your end score but that’s it. (Kirby games in general are, IMHO, easy to learn but hard to master, the artstyle is adorable, and the story is very chill up until the last boss.) If you’re okay with emulation, you can play the older Kirby games online.
Team Fortress 2 - Very very silly First Person Shooter that is more old school and tongue in cheek in its presentation, also one of those “easy to learn, hard to master” games. 9 classes plus lots and lots of different weapons equals a huge number of playstyles that you can experiment with. And also the hats are awesome. Find a server that’s newbie friendly and is willing to work together, though–the gameplay experience is definitely influenced by your human teammates.
Castlevania Harmony of Despair - hack and slash/2d platformer that features both local and online multiplayer. It might be a little tough if your gf is not good at platform games, but if you can find a well-kitted player to carry you guys through the earlier chapters so you can get better gear, you get progressively more badass.
Ooooh! Left 4 dead! It’s meant to be played co-op, and you can have fun playing through the levels multiple times.
I was thinking the same.
It’s a simple action-rpg, with a focus on spellcasting. You have eight different kinds of schools you can combine, with spell-sequences of up to five. You have several ways of executing these spells, like via beam, aoe, magic landmines etc. There is also a set of premade spells. Opposing schools, like electricity and earth cancel eachother out, and effects on your character affects your spellcasting. This results in a very flexible spellcasting system and a ridiculous amount of different spells and effects(I read somewhere that you could have more than 5000 different combinations). Other than that it’s a straight-forward, story-driven arpg set in a parodic fantasy-setting.
I have had a ot of fun with this game. Unfortunately I haven’t been able to bring along friends since schedules seem to always clash. I’m just playing the first storyline atm, but there is as far as I know a lot of DLC.
A few of notes:
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The characters do not speak swedish. It’s mumbo-jumbo swenglish with some swedish and english words thrown in here and there. It sounds ridiculous.
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Contrary to many arpg’s, there’s no progression other than the story itself, finding all the premade spells and discovering your own spells. No levelling at all. Also, loot-finding is very much down-played.
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It is quite hard. Being more than one can make it both easier, and make it a lot more confusing and difficult. Prepare to die a lot, and reember the sequence for ressurection.
MrsPlantv.2.0 and I played DoomII by modem many years ago.
Safest place to stand was directly behind her. 
Isn’t that the game famous for its prostitutes and pornography?
The OP might be looking to spice up his sex life. Killing two birds with one stone.
It’s a LOT LESS hard with more than one person, because resurrection is super easy. The game is really balanced for multiple players, whereas in single player it’s really easy to die and have to restart from a checkpoint by, say, being thrown off a floating island, whereas in multiplayer, as long as one person survives and can rattle off the two-element resurrection spell without dying themselves, you’re good to go.
Yeah, that’s true and that’s why I said it may get easier, OR harder. I guess it’s a matter of ineptitude. Would think it’s better with one player fucking up than two, three or four.
But anyway, it’s a great game and well worth a try.
Hmmm. Second Life is a ton of sims, most of them totally unrelated to one another. It has Star Trek sims, Star Wars sims, Mechwarrior sims, various kinds of combat sims, steampunk sims, dieselpunk sims, and sims that are created just for the sheer what the fuckedness of it. It also has prostitutes and pornography on some of its sims, and much wilder stuff besides. (Pornography, particularly, is a weird concept in Second Life, where you can purchase naked avatars of either sex and dress them and make them act however you like … you can BE the porn, if that’s what you want to do.
There is some prostitution on Second Life, and if you are into pretendy cartoony prostitution, it’s there for ya.
But I think the attraction for a lot of female players is that there are so many designers who clothing for themselves and others. It offers the virtual shopping experience of being wealthy and beautiful. There are TONS of shopping malls in Second Life. I should think his GF might find this very attractive.
So, yeah, Second Life can offer a virtual sex life, if that floats yer boat, but that’s hardly all there is there. And if you’re thinking that’s all there is to it, you’re missing out on a lot.