I've found out the "hard" way literally to be very careful when teasing my dick, especially in the car. You can very easily get to the point where you can't stop. I got sperm on a good suit once. I should have gotten my pants down and had a paper towel to shoot it onto and wipe it immediately. Of course it was a big load and I did my best to wipe up. I was embarrassed and also had a soggy mess in my underwear and pubic hair for several hours. I ALWAYS have pt's in the car for this very reason. I just did it earlier today when I had to pull over in the car.