Ophidiophilia is a subcategory of zoophilia, the sexual attraction to animals in general.
Ophidicism (an act associated with ophidiophilia) is a sexual act in which a person inserts the tail of a snake or eel in their vagina or anus, and receives pleasure as it wriggles to get free.
Ophidicism has been documented as being practiced (as well as many other sexual acts) in Ancient Greece.
Variations include inserting the animal headfirst.
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