I found interesting information on The Origin of the F-Word

Netlore Archive: In which we are told with a straight face that the word 'fuck' originated as the acronym of 'Fornication Under Consent of the King,' 'Fornication Under Command of the King,' 'For Unlawful Carnal Knowledge,' or some variation thereof.

Description: Folk etymology Circulating since: The 1960s Status: False

I am guessing in 1960, its pejorative meaning got some traction

I found interesting information on The Origin of the F-Word

Netlore Archive: In which we are told with a straight face that the word 'fuck' originated as the acronym of 'Fornication Under Consent of the King,' 'Fornication Under Command of the King,' 'For Unlawful Carnal Knowledge,' or some variation thereof.

Description: Folk etymology 
Circulating since: The 1960s 
Status: False

I am guessing in 1960, its pejorative meaning got some traction