I only recently discovered the 'concept' of polyamory after learning about a local triad, who have become our mentors.
In retrospect, I'm pretty sure I was always polyamorous because of my potential to fall in love with new people despite being in existing relationships, yet not feeling like the existing relationship was lacking or anywhere near being over. What an emotional strain that was, trying to be monogamous with those feelings!
I tried swinging and FWB but they don't meet my needs. My wife is also poly so we both crave that emotional connection more than just sex.