I had a girlfriend who was a ripper for a few years, but on the hill, I would say we had more arguments than pleasurable times. I think it mostly had to do with her wanting me to do things her way, not my own - which eventually led to us breaking up (Note to anyone: Do NOT try and change your partner, it just wont work, ever).
My current girlfriend does ride, but she takes it much more recreational and we hardly go out together. We have a much, much healthier relationship, and I think the fact that we keep my skiing and my relationship somewhat separate to a certain extent is a good thing to keep it healthy. She still has to put up with endless jabber of ski talk, but hey, I have to put up with her cooking and cleaning all the time, so whatever.