I didn't learn about it until AFTER I was already in a poly relationship. We had just, fallen in love, and knew we all HAD to be together. We didn't know there were others like us out there. Not until one day I was feeling a bit remenicant and looking through old gf's letters and decided to contact one.
Her and I got to talking and she told me she was married (to a man) I KNEW her, so i asked about a gf, and she went on to tell me about her triad. My jaw nearly hit the floor, I couldn't believe it.
That's the first time I heard the word polyamory. We were so excited that there were others like us out there, in sucessful poly relationships. So yeah, we didn't even know this world existed
We were thrilled to find it to say the least!