At an SCA event a decade ao, I witnessed a friend of mine get hit on by a clueless young man who offered to rub her back. She said "No thank you, I'm taken." whereupon he tried to do so anyway. She said "I. Am. Taken." and we left that particular campfire.

I know there's a higher incidence of poly in the SCA and other non-mainstream type organizations than in the general society, but sheesh! When someone says "No thank you, I'm taken," it's a pretty good sign that they're not poly and that they're not looking.