Simple. It you don't want to do it, don't do it.
From your other post, which I deleted, I question what kind of relationship you have with this man. The reason I ask is because it sounds like you go to great lengths to strut your stuff in front of you sisters boyfriend or husband, I'm not sure which since you used both in the other post. You mentioned repeatedly how you like to put yourself in situations that allow you to flirt with your sisters SO.