Walking back to my car after leaving a club in San Diego, alone, late at night.....is that guy following me? How far to get to the car? The heart starts trying to pound it's way out your chest.....
As a guy, I was well versed in the martial arts, full of confidence against any opponent. As me, that confidence vaporizes (even though I think I could still handle myself if I had to). That, and it's a lot different when wearing a skirt....
Pepper spray may work for some, but when I've seen it used, the cloud went pretty much everwhere, and even the one using the spray was caught up in the gasping/coughing/fight for air. All in all, for me, anyway, the simple things are the safest: go with at least one friend, stay in very public areas, don't drink too much, etc.
It's also a good excuse for two girls to go to the ladies room together