What’s the best part about having sex with 23 year olds... there’s 20 of them.
The Best Part about 23 Year Olds
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Explanation
Experiment
The humor comes from a misunderstanding of the phrase '23 year olds'. Instead of referring to a single age group, it suggests a large number of individuals. The setup leads the listener to expect some benefit from the age, but the punchline plays on the numerical interpretation of the phrase, making the situation sound absurd and slightly shocking.