Originally Posted by Magdlyn
Polyamory is under the umbrella of open relationships. The others are
And here I'll disagree. Polyamory is one of the many things under the umbrella of nonmonogamy--which also includes open relationships. (And swinging and unethical nonmonogamy and so forth).
Polyamory involves romantic ties, whereas simply being open doesn't. Friends with benefits is an open relationship thing; multiple romantic partners is a polyamorous thing.
My wife and I are both open and polyamorous, for example. There are lots of folks who are open and not poly and many who are poly and not open (casual sex doesn't appeal to them).
When speaking of various forms of non-monogamy...it ain't poly if you're just fucking around.
While polyamory, open relationships, and swinging are all distinctly different approaches to non-monogamy, they are not mutually exlusive. Folks can, and some do, engage in more than one of them at a time--and it's all good.