A simple, yet old trick to use when traveling – ladies wear a wedding band (nothing as fancy on the picture) when traveling outside of your element.
In many places around the world, especially the third-world and Islamic countries, this can save you from unwanted harassment. Men can be much more vocal and aggressive in varying parts of the world, and anything you can do to ward some of it off is in your best interest.
Any other advice on avoiding or reducing the catcalls or a good ol’ hand grab ladies?