Oops, forgot to add something small to my message!
About introvert-introvert relationships---I think they can work depending on the people. As for me, I know that's the only thing that WILL work. As I said the most important thing for me is to be understood. Introverts are pensive and deep for a reason--because they spend so much time thinking. I guess INXXs can probably work but ISXXs, I'm not too sure...?