I’m not convinced that this accurately describes all of the ways that people are non-monogamous, but it definitely captures many of the complexities and the relationships between different structures.
I especially like his explanation for making this chart:
I’ve been told, many times, that the word “polyamory” is not really necessary, as it’s simply a synonym for “open relationship” or “swinging” (or, depending on the person talking to me, “cheating”). This idea seems to assume that there’s really only one kind of non-monogamy, which is kind of silly.
There’s a bit more at his site. Check it out. 🙂