Dating between different species in Azeroth

I'm specifying dating because I'm not asking about biological reproduction. There are enough orphans around Azeroth that my OCs could adopt if they want kids.

Outside of faction and political conflicts, would there be social taboos against dating outside one's species or, I guess, genus or family? I'm not exactly sure how to classify some of these cousin races like Tauren - Yaungol or the many flavors of elf available. Would there be any religious taboos?

I'm thinking specifically of a Blood Elf and a Pandaren, an opposites attract type of couple, but I'm curious if people have thoughts about any other possible pairings.