The difference is, of course, that most guys only do this in their head:

Tzaneen [South Africa]- Sexily-dressed women in a small Limpopo town have fallen prey to a group of teenage street kids that masturbate in public whenever they see them.

It would seem to me a largish can of mace and/or pepper spray would be a nice addition to this lady's purse. You'd certainly have more things to aim at.