Speaking as someone who is poly, you write it really well, some of the best I've seen in fic, which I really appreciate. As far as I can tell, there are people in the world who simply don't have relationship jealousy, and there are people in the world who do but want to have multiple relationships and just manage the jealousy, and there are people who don't do poly because of jealousy or some other reason. And I've seen both of the first two types in your fic, and it's rare for people to write both.

So yeah, whatever research you're doing, it's good and rings fairly true to at least my life, although of course my life is not universal poly experience or anything like that. (Which is just as well, because of my four partners three are long-distance, and I gather most people hate long-distance relationships...)