Otherwise, the usually accepted first known occurrence of the word is found in code in a poem in a mixture of Latin and English composed in the 15th century.
The poem, which satirizes the Carmelite friars of Cambridge, England, takes its title, "Flen flyys", from the first words of its opening line, Flen, flyys, and freris ("Fleas, flies, and friars").
Some English-speaking countries censor it on television and radio.
In any event, the word fuck has been in use far too long for some of these supposed origins to be possible.
There may be a kinship with the Latin futuere (futuo), a verb with almost exactly the same meaning as the English verb "to fuck".
From fūtuere came French foutre, Catalan fotre, Italian fottere, Romanian futere, vulgar peninsular Spanish joder, Portuguese foder, and the obscure English equivalent to futter, coined by Richard Francis Burton.
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.
The line that contains fuck reads Non sunt in coeli, quia gxddbov xxkxzt pg ifmk.