I find it very amusing that personality traits that MOST people possess, and are common to monogamous relationships also, are being attributed solely to polyamorous people
Franklin Veaux has updated his Map of Non-Monogamy. Check it out.
There seems to be a lot of confusion regarding the definitions of particular relationship matters and structures. So in an effort to make the world a better place I hereby attempt to clarify things a little.
Estimates are that about 20% of couples in the United States practice some sort of consensual non-monogamy, whether it be polyamory, swinging, cuckolding, an occasional threesome or just plain having an open-relationship with permission to date and have sex with other people in one manner or another.