All poly people are Pagan. All poly people are libertarians. All poly people are social liberals. Just to put in equal time for other myths. Some of my closest friends still don't get it.
Poly people are all straight, except for the occasional bi female.
Poly people are all either men or women. Poly is a USAmerican thing. Poly is a GenX thing. Poly people all like to cuddle with anybody. YES, that's exactly the myth that most Drives.