That is about the excluded middle I was thinking of on those questions. Reference Dan Savage's term "monogamish." This community seems more likely than average to have unusual degrees of relationships.

I was also wondering about "preferred" relationship style. I know several who would prefer polyamory in theory but in practice have never had it work out well in practice. Granted, I know several who have never had monogamy work out well in practice and more who have discovered that they were not in fact in strictly monogamous relationships.