I'm not technically polyamorous, but I believe I technically count as one. I don't prefer to date more than one person at once, but I will if I love two people and both of them consent to me dating the other as well.
I don't like doing it because I don't want to be a 'w**re'. I've literally only done this once, which I believe makes me polyamorous, even though I probably won't do it again.