Oh I love doing this.

In my early years I would jerk of in the bus on my way to school. I put my dick into the leg of my pants and grabbed it from outside. By squeezing it like you would squeeze toothpaste (sequentially pressing the fingers onto the dick) i would have an orgasm after about 20 minutes, which was juuuuust fast enough. Because the bus stopped at about 21 minutes and sometimes I didn't have too much time to put everything back in place.

In public bathrooms and in school ofc, who didn't.

Nowadays when I ride home by train, the station before the last is the main exit point for most of the passengers. There are only a few passengers left in the train and that's the time when I take out my dick and jerk off. If someone would go by, he would actually see my dick.

NEARLY happened once, but I was able to pretend to search something in the bag in front of me.

I also drove into a little park when it's raining softly. Most people avoid the park when it's raining and dark, so I was able to get completely naked and jerk off onto the wet gravel ways.

We also have a little town, more of a village, some kilometers of where I live. There is a little parking lot at a cemetery, which also gives access to the riverbank (levee? The one high enough to hold off stormfloods, something like this.) It is really uncomfortable to stand there, when it's even lightly raining, because of the huge free space, wind and the floor is a bit slippery. Here I also managed to get completely naked and jerk.

The long street that leads to the village is sometimes full of mist. THAT was too cold to get completely naked in, so I just let my pants fall and jerked off, but it was especially funny, because I could see the cars driving past me with their headlights on, but they couldn't see me because of the mist. At least I hope they didn't see me.

Oh I also once did it in front of a village-government building deep in the night.

And at work in the bathroom.