Interesting perspectives so far. GalaGirl, I don't understand most of your answer, and I often have difficulty making sense out of the language you use in your long posts, but I appreciate the effort you put into your reply.
Compatibility, hmm... this morning I was remembering how I've had lovers with whom I've been very compatible sexually and yet not get along at all outside the bedroom, and visa versa. Those kinds of relationships didn't have much longevity, but some were fun for their respective reasons. They didn't work for being monogamous, but I wonder if situations like that probably would work better now for living polyamorously.