I think the Johnny Depp thing is the major curve ball with INFP(m) and ENFJ(f). INFPs can be passionate to the point where it encompasses our entire being, affecting every aspect about us. I can totally see how that would draw in a stray ENFJ (or honestly, a wide variety of types). I've noticed that when you combine that with the somewhat shy and awkward mannerisms we tend to have, it creates an odd mixture that seems to entice ExxJ types in particular. Perhaps because we naturally bend but are very hard to break?
The challenge is that from the ENFJ side, the INFP may be a bit too prone to envelop their emotions to detrimental effect, with little desire to get out of it. This can be bad when the ENFJ looks to the INFP for male strength or support, or when the INFP won't share the emotions so the ENFJ can't understand why we feel what we do. On the other hand, INFPs can resist the ENFJ tendency to try to invoke a reaction, especially if it's an intense emotional response. Alot of those issues may still exist with ENFJ(m) and INFP(f), but gender roles provide a context where they are acceptable and to some extent even desirable.