I did this once in the military - two bodybuilders. They said they were identical twins, but there were a few little differences on their bodys (a mark there, a mark here).
Their cocks looked pretty much the same. As far as shooting, could not tell you. One was fucking the other & shot that way. It was an interesting experience, only got to do it once because they both apparently had the same "type" and the first one that I met, made sure I would not see the other one again
