Is it fine to add TV shows in the mix?
A lot of manga, and their adaptations, have love triangles. I've been watching the Korean version of Boys Before Flowers on Hulu (I've seen the Japanese one already) and keep thinking polyamory would help so much! There is an obvious N in the story.
I've also been watching flashforward, and I don't know how it ends, but I doubt that is does with the poly vee I have been rooting for from the start of the show.