I dunno if it is true but a ex firefighter told me that as the body loses blood the penis shrinks to its physical yet unfilled size ,therefore leaving it smaller than if you were alive.If you dont get smashed to pieces when you die you get to keep your cock just the way it is. Maybe that or he saw lots of smashed up dead dudes with little weiners.
i doubt that is true, ive seen a lot of dead guys on here with immpressive cocks