For the gun to work the trigger requires pulling. Is he pulling it with his dick? It's like Pacific Rim all over again .... you'd need to fold ya dick around the trigger, so it would have to be flaccid. Being flaccid you'd have no ability to 'pull' the trigger. Unless the thrusting action is so violent the flaccid penis pulls the trigger.
Obviously someone is going to have to try this out. I may write to myth busters.
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