Whereas none of the women with whom I've been involved have ever matched my libido. My wife knows I'm ready if I'm not ill to the point of wanting to die. I don't even have to be awake, as I have a history of SBS (Sexual Behavior during Sleep).
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.