Poly people are just in it for the sex. Polyamory has nothing to do with sex. Poly people never cheat. Poly people within a relationship are telepathic. Poly people all have group sex.
Poly people are all promiscuous.
There is a secret magic spell that will convince your spouse to try poly. There is a secret key that will gain you access to the Land of Bisexual Women Who Want to Make a Family With You and Your Spouse. Poly folks all have byzantine sleeping schedules posted on the refrigerator. Poly folks are all into SF Fandom, SCA, and RenFaire. Make sure that your spouse is aware of the existence of poly.