I did date an INFJ female once, she knew about MBTI before I ever met her so, she had already done her own research so I assume she was, and in my experience, she certainly was. We shared a very deep clarity of perception on things and saw things in a similar way, maybe we didn't share all the same beliefs about those things, but we did it the same way, the same neurotic tidal wave of connection making and boiling everything down and over thinking everything to death all of which produces that sense of fear/need of something genuine to cling to for stability. She was trusting so she opened up easily and the connection grew quickly. We had really great physical chemistry too, I will spare all the gooey sexual details but it was like a porno movie... My firm belief is that INFJs in general make excellent lovers this is based on my discussions, interactions and personal experiences with women who I have slept with. Its that need to please the other person as primary I think. Why wouldn't people love that? People in general are selfish.
I think it could have really worked out with her if I didnt screw it up, we were similar in a lot of ways we did things, but I am unscrupulous and a villain while she was a genuinely good person, I think I would have eventually brought her down, which would have been a pity so theres that lol.