I'd say I am a 4 I prefer poly. I have been in a mono relationship where I was faithful but cheated on. I tried to open it to save the marriage because of children but he preferred dishonesty. Marriage two was mono and faithful but once we divorced we were more poly. He slept with my new girlfriend, and me etc. My current marriage is and always has been poly understood though my partners are both mono by choice and lack of availability respectively. And I am faithful within the triad. So I have had a fluid evolution to practicing what I have always preferred. Would I be open to other set ups? Absolutely, I serve honesty and transparency and greatest happiness possible so yes if it changes I will go with it as long as everyone is as happy as they choose to be.