Around the year 675, the King of Wessex in England, Harold who burnt the cakes, passed a law that stated
Love making was not allowed without permission of the king
To make love to your Wife, Girlfriend, or Mistress, a man had to go to the local
agent of the King and get a consent poster
This was nearly always the local Priest, or Abbott
They would issue you with a poster to nail on your front door stating that
'Fornicating under consent of the King'
After a while this document got shortened to the initials
F.U.C.K.
Now you now that this word has the consent of Royalty