By application of Grimm's law, this hypothetical root has the form *pug–.
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.
One reason that the word fuck is so hard to trace etymologically is that it was used far more extensively in common speech than in easily traceable written forms.
There are several urban-legend false etymologies postulating an acronymic origin for the word.
None of these acronyms was ever recorded before the 1960s, according to the authoritative lexicographical work The F-Word, and thus are backronyms.
During the Black Death in the Middle Ages, towns were trying to control populations and their interactions.
Since uncontaminated resources were scarce, supposedly many towns required permission to have children.
"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.
In any event, the word fuck has been in use far too long for some of these supposed origins to be possible.
Some of these urban legends are that the word fuck came from Irish law.
Journalists were advised to refrain from censoring the word but use it sparingly and only when its inclusion was essential to the story.