Yea, I'm inclined to agree with those who point to sex. It's a "little or no commitment" attraction - YOU are poly - so in contrast to their usual pursuits of mono mates - you offer the "what's good for the gander is good for the goose" option. Remember how little most of the population understands about poly concepts. For most when they hear it it just means lots of sex partners. And in a world of sound bite mentality - few will bother to research !