I haven't read that yet, but they did try to pick up on Anne McCaffrey's Pern mechanics of dragon mating - which basically are gang bangs, too - which I didn't realise at the time and I read them first in my twenties, so hmmm.

You have to be open for any sort of love and lust (although I haven't come across non-consensual stuff, etc.), there can be happy three-somes in other books, too.