I would think that in a big city like Chicago, you would have a wider range of polyfolk there than just the geeks and nerds. In NYC, most of the poly people I've met are into kink and BDSM and all that so-called sex-positivity stuff, but I occasionally meet a few non-kinksters.
Have you checked out any local poly groups? I'll bet there's more than just one.
The world opens up... when you do.
Oh, oh, can't you see? Love is the drug for me. ~Bryan Ferry
"Love is that condition in which another person's happiness is essential to your own." ~Robert Heinlein