They always attract me because they seem deep enough and intelligent enough to understand me. I always assume that anyone that rational would be great at avoiding the usual mistakes that can ruin a relationship, but their knowledge only extends to trivial areas and never touches the core of what I need in order to be content. Also, it seems that there is very little I can provide that they would need. The things I most want to offer a partner, that I most want to be cherished for, are things the average INTP would not consider important or valuable. I would feel as though my needs were being neglected and my greatest skills were being wasted.
The problem with having to explain ourselves in order to be taken seriously is that language happens in a line, confined by the fact that time is a narrow thing that doesn't allow for words to be spoken simultaneously in layers. We may never be able to express the directions our minds move, so most of us resort to art, music, or abstract poetry in order to make up for this limitation. We also tend to use a lot of symbolism, since the things we are really wanting to explain are essences that don't have words. They are combinations of factors that must all be present a certain way in order for that essence to exist, and we look for other similar situations in which those factors are also present, to clarify. If situation 'A' has this quality, and situation 'B' also has this quality, even while all of these other things are different, then through this description of 'B' you should understand what I am trying to tell you about 'A,' but it doesn't usually work that way when talking to an INTP. INTPs tend to find lots of tangential reasons why B isn't really like A, and they miss the point. We know that B isn't really the same thing as A. We just don't have any better way of getting to the core of the thing we mean, which is the common thread that relates the two, but which is too abstract to define.
I would not recommend an INTP/INFP relationship. I've done that too many times. I always think, "This one will be the exception, because he seems balanced. With love, we can work through anything," but I am always mistaken.