What's the difference between homework and a hooker? They both start with an "H", but we all know which one we would like to do.
Homework vs. Hooker
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Explanation
Experiment
The joke uses the similar-sounding words to set up a double entendre. The punchline plays on the listener's assumed preference for a 'hooker' over 'homework,' utilizing the double meaning of 'do' to imply sexual activity.