Masturbating is always fun, but doing it while driving and being potentially exposed adds an extra thrill. Done it many times and since my cum oozes and surges rather than shoots it makes containing the mess pretty easy. Then since I'm a self eater the evidence is quickly cleaned up
I jack off every chance i get. Driving, walking the dog, at the office. But my favorite is to have a 6.5 inch dildo buried deep and my riding that thing until i explode.
if i am driving alone i will pull my pants down and rub myself so truckers can see me and hope they have me in their sleeper and do my hole really good