What is for unworthy cornal knowlage?

The phrase is actually "For Unlawful Carnal Knowledge" Or sometimes also referred to "Fornication Under Consent of King" These phrases are commonly believed to be the origins for the acronym of the ever so popular "F" Word. However, these phrases are most likely not the true root of the Word, instead it, like many other slang curse Words, evolved out of a very similarly sounding Word and took new meaning.