Spooge's Spit Up - The Origin of the F-Word

I have no idea if this is true, but it seems as plausible as anything else I’ve heard….. but I don’t think I’ve ever heard another origin of the word.

In ancient times a person could not have sex unless you had consent of the King (unless you were in the Royal Family). When anyone wanted to have a baby, they got the consent of the King and the King gave them a stone sign that they hung on their door while they were having sex. The sign had F. U. C. K. written on it (Fornication Under Consent of the King).