"Either this refers to an inexperienced copulator, referring to someone trying to have sex with the navel, or it's a rather extravagant explanation for a dimwit, someone so stupid they think this that is the way to have sex," says Booth.
An earlier name, that of John le Fucker recorded in 1278, has been the subject of debate, but is thought by many philologists to have had some separate and non-sexual origin.
Some of these urban legends are that the word fuck came from Irish law.
If a couple were caught committing adultery, they would be punished "For Unlawful Carnal Knowledge In the Nude," with "FUCKIN" written on the stocks above them to denote the crime.
it is uncertain to what extent the word fuck was considered acceptable at the time.
The word has probable cognates in other Germanic languages, such as German ficken (to fuck); Dutch fokken (to breed, to beget); dialectal Norwegian fukka (to copulate), and dialectal Swedish focka (to strike, to copulate) and fock (penis).
which refers to the act of sexual intercourse and is also commonly used as an intensifier or to denote disdain.
Its origin is obscure but is usually considered to be first attested to around 1475, although it may be considerably older.
By application of Grimm's law, this hypothetical root has the form *pug–.
There is a theory that fuck is most likely derived from Flemish, German, or Dutch roots, and is probably not derived from an Old English root.