urgentYes. It was a problem for me until I was about 14 , as well. What it was/is, is that I simply do not feel the urge until it's well, urgent. By that time, there isn't always enough time to run to the bathroom, or iI didn't make it in time. As I got older, my control must have gotten better or something.
As far as a solution, don't shame him at ALL- it will only make everything worse. Do make him stop what he is doing, go take his clothes off, take a shower, and wash his clothes before he resumes the activity.