There probably isn't a definitive answer; etymologists aren't absolutely certain where it came from (I'm assuming you're talking about the vulgarism for "to copulate" here).
Probably the best theory is that it comes from a PIE root something like *pug- meaning "to strike" and arrived in English through the Germanic languages.
It absolutely does not have an acronymic derivation ("For Unlawful Carnal Knowledge" or "Fornication Under Consent of the King"); if it did, there wouldn't be the wide variety of cognates in the various Teutonic languages, and acronyms were essentially a 20th century invention... any supposed explanation of a word that existed before, say, 1900 that claims that it's an acronym can almost certainly be immediately dismissed as false.
Answer
The earliest written use is from 1475. The word has Germanic and Anglo saxon origins.
well theres 2 f words f*** and f*ggot the person who started the word f*ggot was rapper eminem and he got protested for saying that word so many times on his album the marshall mathers lp
The f word is now considered bad because it was started being used in other forms meant to be insulting. The original meaning was to fornicate under consent of the king.
i started cussing when i was like 10, and once in school i said the word suck and they thought i meant a cuss word, so thats where i learned the f word.
The f bomb is the f-word.
The duration of The F Word is 2640.0 seconds.
Its the "f" word. If you don't give a "f", get the "f" out the club! I'm "f"d up! Etc
No. The f word is not used in the notebook
The F-Word - book - was created in 1995.
An action word that stars with f is fly!
Whilst "fudge" is an acceptable alternative, it is not "the" f word.
The F Word - film - was created in 2005.
kosiba, "to f"