If somebody else's dish (and we mean dish, not doll) looks particularly attractive, don't sample it unless you're first asked to. If you'd like to try it, order from the waiter!
Do not eat garlic or onions unless your escort also does. (Or unless you want to keep the wolf from your door.)
We've already inveighed against the bore who table-hops and asks to dance with your dame. Now the might of our wrath is directed toward the gal who makes things worse for her man by encouraging the intruder. When a stranger comes to your table, say "No," immediately. Don't prolong the agony by turning to your escort and asking if you should dance with the drunk or dope.