"Not for me". I'm open minded, and maybe, under some set of circumstances it could happen but realistically I see myself as "monogamous", or at least "mostly monogamous", whatever that means.
On the other hand I have a family member who is in a poly relationship. They seem happy, and when one partner left the relationship because they realized they had grown apart they remained friends and still get together for cookouts and stuff. How many monogamous couples can say that if they split up they would still remain friends?