yes, I believe that as well. perhaps it's all those sex pheromones being released when pissing that makes men want to compete, either they will just let you watch or they will get hard for you even if it's just to try to impress the other guy watching. most men don't really mind if you watch them pissing, it's not considered sexual. when you enter a urinal, don't go to the other end of the stand, it's considered unmanly to hide when pissing, stand within sight and vision of the other guys, they really will not mind. truck stops are fantastic, but they are monitored and if things get to out of hand.. so to speak (lol) they will shut them down, state troopers are known to entrap truckers who fuck and go overboard in these places, it's not illegal to get erect and show to another guy but actual grabbing a dick can get you arrested even it is willing, undercover cops can arrest you.
9 times out of 10, when a guy goes to piss, and has his cock in hand, he is getting turned on, and wants to wank or get sucked, once the cock is out, it is ready for play, thank goodness, lol