In all seriousness (well, as serious as we're going to be able to get on this thread), a 4-hour erection is a sign of priapism, which is nothing to joke about. If you don't get medical treatment for it within a few hours, you could end up never having another erection again.
(To get technical, the blood get stuck in there, loses its oxygen, and you end up with the same problems you'd have with any other body part that had its circulation cut off.)
Supposedly it also hurts like hell, too, so you'd probably be hightailing it to the ER regardless. ;)
Poor little guy.
(To get technical, the blood get stuck in there, loses its oxygen, and you end up with the same problems you'd have with any other body part that had its circulation cut off.)
It turns blue and falls off?