My wife is 100% introverted, so if I'm not her friend, she's lonely (one key stressor for me - she is very dependent for friendship). I doubt I'd ever satisfy her this way if we can't find things to talk about without disagreeing. She's thinking about working, that might help. Conversations for us have been like Al Gore talking to Ex P Bush...lots to disagree on.
Have you heard of any books that deal with developing common interests?