Polyamory. If you've been paying any attention lately, you've probably heard the term. TV shows, books, magazines, and social media are abuzz with what appears to be widescale experimentation in consensual non-monogamy. But what does it mean? Where did the idea come from? How is it different than swinging, friends-with-benefits, having a side piece, or any of the other possible sexual arrangements? Christopher Gleason, author of American Poly: A History, explains.