Some mythical yogis were said to store up enough sexual frustration (they said energy) that they could fight gods. Apparently they usually were taken down by a nymph.
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Graffiti outside Latin class.
Sed quis custodiet ipsos custodes?
A juvenal prank.
According to a book on Taoism I read, the mustache is a repository for excess sexual energy. Which explains why Taoists in early china has such huge mustaches and beards.