The real etymology of the word “fuck” is unknown. It could come from the Latin word futuere, from the Greek phyo, or from a Germanic origin. German has the word ficken, Dutch fokken (to strike, to beget), dialectal Norwegian fukka (to copulate), and dialectal Swedish fokka (to strike, to copulate).
Urband legends have also made a contribution to explain the origin of this word. One of the urban legends says that the “F” word is an acronym originated from: “Fornication Under Consent of the King”, because in ancient England people could not have sex unless they had consent of the king.
Another urban legend is that the word “fuck” is an acronym which comes from the 1800′s in London, when it was used to charge prostitutes ‘For Unlawful Carnal Knowledge‘.
Something is certain about the “F” word: It is considered obscene in polite circles, but it’s widely used in informal and domestic situations.