I've been having problems with my one cat "nursing" on my ear. At first it was sweet, but now he wants to do it for literally hours at a time. I previously posted asking for advice on how to get him to stop, but have been unsuccessful at getting him to nurse on another object. I have a friend who suggested putting bitter-tasting nailpolish (the stuff you're meant to use to stop biting your nails) on my ear to discourage him. Is this safe for him? Is there anything else I might use that would be better (I don't really want to walk around with painted ears, you see...)