No, they arrest people for that. You only see them running on the field. Once they cross, they are jumped by police and arrested. Exposing yourself is a crime. But there is something more inherently troublesome when you are exposing yourself to someone in particular instead of a crowd. There are some implicit threats in that. I'm not saying he's evil or a bad kid. You can be a good person, but struggle with sexual behavior. It's just that there is a part of our brain that tells us that even though we may feel like doing something taboo, it would be very unwise to do it and so we don't. When people do act out, they struggle with that rational thought process.