A ridiculous challenge between male friends to determine who can ejaculate the most times within 24 hours.
Guy 1: I bet you guys can only jack off twice before you can't anymore!
Guy 2: Why don't we have a spermathon to determine who can do it the most!
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When your sperm do 42 (micro) kilometres for their chosen charity(s).
How did your little guys do at the Spermathon earlier bro?