I’ve only seen this behavior in New York City. Twice.

The first time I was walking in Times Square with a girl friend. Possibly the most crowded place on earth. I was wearing a tiny red dress. It was summertime. This guy kept following us. I thought maybe he wanted to pass us, so I slowed down to let him through. He slowed down, too. I sped up to lose him. He kept up the pace. Finally I turned around to confront him. He unzipped, got his dick out and jacked off right in front of me. “Ewww!” I shrieked and jaywalked across the street to avoid getting splattered. I told Jay about it that night and he said I was lucky he didn’t have a knife or a gun and try to mug us. Then he said the guy probably got the reaction he wanted anyway. Anyone who does that is in it for the shrieks.

Second time I was in a subway station waiting for the uptown train. Across on the downtown platform was a guy with his dick hanging out jacking off right there. At least there was more than ten feet between us, but Jeezus!

Here in San Francisco I’ve only seen shriveled up dicks on naked old guys at costume parties. (Why is it never the hot ones that show up naked in public places?)