Originally Posted by River
That's what folks used to say about gay people -- before gay people began coming out of the closet in vast numbers. My point being that you've both probably met and interacted with plenty of poly folks who just didn't happen to mention their poly status (for whatever reasons). A LOT of poly folks are in the closet about it. Which is a shame.
To add to this, a LOT of poly folks, also think that they are "swingers". My wife and I did for the longest time. Then we found the word for it.