ISFp supervises ENFj. It would seem to me then, that people who have ISFp as their exertion type would not tolerate the activity of an ENFj IE type partner. (citing "drama" issues.) But they may choose an ENFj IM type.
I've actually noticed this in a lot of dating profiles. ("NO DRAMA!!")
I like drama myself, though to borrow labcoat's spin on the dual-type model, I tend to find myself a detatched observer of a world full of dramas. The battle of good vs. evil rages on between all people, and I simply find myself in the middle of it trying to bring some clarity to its persistence. Obviously an ISFp IE type would be trying to put an end to it all together.