I've been wondering, though, if "Why not?" opens the door too easily to the endless list of anti-poly sentiment. I can already hear in my head some possible responses like jealousy, lack of commitment and faithfulness, insecurity, damaging to children and families, immoral...
I could address each and every one, of course, but it would take time and patience and why put myself through all that for the average individual? I think I prefer the "Because it works for me" response if I'm looking for a short and sweet end to the conversation because it's not really something they can argue against.
Pan Female, Hinge in a V between my mono (straight) husband, Monochrome and my poly (pan) partner, ThatGuyInBlack