In fact finger lickers anywhere but in the privacy of your own home-

Take heed- your spit has germs that I don't want. Thus when you greedily load up your plate at izzys (or the fucking sunday brunch at the country club ANYWHERE) and you accidentally besmirch a digit with ranch dressing or stroganoff lets say, Do Not clean your finger by tasting your finger!
See- your next move is to grab the tongs or ladle on the next dish and guess what? You just transmitted your filthy microbes to the next person in line.
Do I really have to tell you this?