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.
The line that contains fuck reads Non sunt in coeli, quia gxddbov xxkxzt pg ifmk.
However, the connection to futuere has been disputed—Anatoly Liberman calls it a "coincidence" and writes that it is not likely to have been borrowed from the Low German precursors to fuck.A similar variant on this theory involves the recording by church clerks of the crime of "Forbidden Use of Carnal Knowledge." Another theory is that of a royal permission.During the Black Death in the Middle Ages, towns were trying to control populations and their interactions.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.