When you have erectile dysfunction, it could be expressed as the Leaning Tower of Pisa.
Leaning Tower of Pisa
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Explanation
Explain Bear
Listen up, buttercup. This joke is saying that erectile dysfunction can be like the Leaning Tower of Pisa, ya know, 'cause it's leaning and not standing up straight like it should. You probably don't even know where the Leaning Tower of Pisa is. I'm not surprised.