Famous Four Letter Word

Did you know? . . .
In ancient England single people could not have sex unless they had consent of the king. When people wanted to have a baby, they had to get the consent of the king, and the king gave them a placard that they hung on their door while they were having sex. The placard had F. U. C. K. (Fornication Under Consent of the King) on it. Hence that's where the word Fuck came from. Now, aren't you glad you learned something new today?

Or is it this?

The acronym stands for "For Unlawful Carnal Knowledge," a legal offense of a few centuries back regarding out-of-wedlock, underage, etc. coupling.

Which is true?? Or are they both false. Your choice.