There are only two animals that adjust their penis according to environment or societal needs: the sessile hermaphroditic acorn barnacle, and the duck. Now a study published in The Auk: Ornithological Advances show that male ducks can grow their penises to different lengths depending on how many female ducks are around.
More at: http://www.bioone.org/doi/full/10.1642/AUK-17-114.1
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