Sounds like such a great thing, doesn't it?

I can't really say that I've had any really extensive romantic experiences with other INFPs but I felt compelled to post anyway. For, I met someone about half of a year ago (whom I definitely believed to be an INFP) and I felt deeeeply connected with her very quickly. And though I dream about how wonderful something like that could be I think about how many other factors would be important to consider.

Going on personality typing, afterall, I think the Enneagram offers a bit of deep important insight which could also be greatly factored. MBTI is, afterall, only one template to use for the understanding of an incredibly complex structure: fate, on top of the human psych.
Also, maybe once an INFP finds what they need (or close to), an identity, they could perhaps benefit from someone a bit more anchored to the physical. Stuff like that.

I'm interested too to hear about other's experiences.

I think any personality can form a deep connection with any personality. However, in any good relationship there must be a strong understanding of one another. And the way you would go about forming an understanding of your partner would differ from personality to personality. The closer the personalities two people have, the easier it might be for them to quickly understand each other. More contrasting personalities might require more work to reach understanding, but can have the benefit of helping the individuals to expand their own ways of thinking.

I wish I had more experience. In theory, it sounds great to me. In practice, getting two people together who are hard to find and who might initially seem shy and non-sexual is not easy. The worst part is that many INFPs don't like themselves and probably will reject people for reminding them of their own "flaws." I could go on. Two INFPs together probably won't work unless at least one is well-adjusted.

I think 2 infps would make great friends, but not partners.

I've only had a 2-date fling with another INFP and although we got along well, and opened up to each other quickly, there was just something lacking (passion (from my side)? opposite-ness?) and needless to say, things didnt work out.