I dated an ISFP for a few months. Like UDP, this was before any kind of psychology framework in my head that explained to me what was going on.

I should have known we weren't compatible, because we couldn't have any kind of substantial conversation. We would just flirt a lot and joke around but it got boring real fast. At least for me, I think she was kinda ok with it. We lasted as long as we did because I was away at school and only saw her every other weekend or so. Every interaction I had with her felt so unnatural and forced, I was very happy when I finally ended it. She's still a fun person to get drunk with though .