Let's say you're in Italy and you're getting even slightly harassed by an over-effusive man, just smile, and be firm when you tell him to back off. Point to the ring and make the universal sing for, "my husband will kill you, if you dare....." and watch them shirk away. No Italian classes necessary. Actually, learning how to scream, "fire," in the local tongue is a good way to get fast attention if you're feeling threatened.

Even if you're not married, especially if you're not married, keep the stalking-types away by appearing to be with someone who is bigger and badder than they are. I find this effective because men are more intimidated my bigger men than by damsels in distress.