(NSFW) Do you think love between three people could exist?

I was chatting to a friend of mine today, about how I would like to meet a couple and perhaps enjoy a loving relationship. Ideally it would be a loving relationship between all three of us. I am not talking a “threesome” but rather a committed three way relationship. How common is this? How plausible is it in terms of most couples just wanting a “sexual threesome”? Have you ever met anyone that accomplished this?