Well, my girlfriend knew that I thoroughly enjoyed WoW. I made it pretty clear when we first started "talking". After we moved in together I handed her my computer (just a little over a month ago) and suggested she make a character and mess around a bit. She made a mage and quested up to level 6 and then we had to do other things.
Her friend came over that night and they were drinking and I ended up going to bed early because I had work the next day. She texts me at work the next day to tell me that she had made her own account after I went to bed and quested to almost level 10 lol.
So, basically, what I thought was going to be a hassle turned out really simple, because she's a huge fucking nerd. And I love it.