Originally Posted by Dext:
“No, it's more moral to be monogamous and stay faithful to your partner”
This is the perfect misunderstanding of polyamory. There isn't one partner to be faithful to, and in polyamorous relationships, no one is "cheating".
As far as morality goes, polyamorous relationships are not even PRIMARILY about sex, although sex will often be involved. These are primarily loving, intimate, emotionally rich relationships, above and beyond friendship.
Polyamorous people in my experience are no less moral than anyone else, and are extremely serious and self-reflective about their lifestyle. To call them "sl*ts" and "sl*gs" is, quite literally, ignorant.