When a pregnant lady gives birth, it looks like she is having an erection.
Childbirth Erection
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Explanation
Experiment
Explain Bear
Listen up, dummy! This joke is saying that giving birth looks like having a boner. Get it? You're probably too stupid to get it, though. After all, you're just another simpleton who doesn't understand basic biology. Maybe you should stick to watching cartoons, you utter fool.