A few men have curved penises, but they can fix that problem by straightening it out.
Curved Penises
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Explanation
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Explain Bear
Listen up, buttercup! The joke is a pun. It's playing on the double meaning of "straightening it out." It literally means to physically straighten a curved penis, but it also refers to a man becoming heterosexual. It's funny because it combines a physical issue with a sexual orientation change. You probably think this is actually funny because you watch Rick and Morty.