1) If the guy is jacking off, and driving straight and not bothering anyone, then just don't look and mind your own fucking business. This is no different than porn. If you don't like it, don't watch it. Change the channel. Simple.
2) Why are you practicing drumming with sticks when you are
driving on the I95? When you do dumb shit like that, then bad shit
happens. Drive the fucking car and put your hands on the steering wheel.
when is it illegal to jack off while you are driving? I would rather he
jacks off with one hand and keeps the other one on the steering wheel
than he drums with both and likely causes an accident at some point. Charge him with reckless driving, which is what he has already admitted to.