The reason I'm gay is because I'm scared of getting cooties.
Cooties Excuse
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Explanation
Experiment
Explain Bear
Listen up, buttercup. This dude is saying he's gay because he thinks girls have "cooties." Cooties is a kid's term for germs that girls supposedly have, and boys don't want to catch. The joke is that he's avoiding girls altogether because he's scared of those imaginary cooties! I'm sure you have your own imaginary problems!