While dissecting alligators to see how they mate, Diane Kelly, an anatomist at the University of Massachusetts,
found an always erect penis:
To see how it popped in and out of the alligator's body, she tugged on various tendons and muscles in the cloaca region and found one set of muscles that caused the penis to shoot out. Another set of tendons attaches to the base of the penis like rubber bands, she said.
"As soon as those muscles relax, the penis gets whipped back into its original position."
Go to the link see video of this... operation.
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