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 explanation I heard as a kid was that it stood for: For Unlawful Carnal Knowledge.
In ancient England single people could not have sex unless they had consent of the king. Supposedly “swive” was excised from texts by the Censors and replaced with the inscription “For Unlawful Carnal (or Cardinal? At least this is what I learned in college — or was it the streets?
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Second base is direct physical contact, usually meaning his hands to her breast.
They would be tried and sentenced, hence you’re FUCKed now etc . With precious few exceptions, words of acronymic origin date from the 20th century and no earlier.
It was said that this was a British Army charge used when soldiers were caught shagging without permission (I was never sure if it was shagging women or each other). Though a few common English words have grown out of acronyms (words created by taking the first letter(s) of major words in a phrase), ‘fuck’ isn’t one of them.
There are, as the top comment on this question notes, four bases in baseball, and these have corresponding sex acts associated with them.
"I got to second base with that girl yesterday." "I didn't think I had a chance, but I made it to third base with her last night." One of the other answers has provided a nice link to the Wikipedia entry for baseball metaphors for sex.