The etymology of the word Fuck and its many bacronyms is fascinating and in my opinion underscores how man kind can take a questionable word and call it evil/provocative in the name of god because of its uncertain meaning.

     Fuck is the most versatile word in the English language. It is the only word that can be used as a verb, (transitive and Intransitive), a noun, an adjective, an interjection and an expletive infix.

     Fuck today is largely considered to be an offensive profanity but was considered to be an acceptable word as late as the 17th century and as early as the 16th century in England. The origin and complete etymology of the word Fuck is un certain because of its common use in every day speech than in traceable written documents but the first known occurrence was written in a poem entitled, "Flen Flyys" sometime before 1500 composed in a mixture of Latin and English. The line containing Fuck in it originally reads, "Non sunt in coeli, quia gxddbov xxkxzt pg ifmk". Take away the substitution cipher and it translates to, "they are not in heaven because they fuck the wives of Ely". Sources suggest the phrase was coded because of its meaning and was uncertain to what extent the word fuck was considered to be acceptable in society.

     Un true etymologies of the word Fuck are my favorite. Fuck is a backronym or a bacronym as opposed to an acronym because acronyms for Fuck were never heard of before the 1960s and the word Fuck has been used for more than a millennium so it is likely that all of the bacronyms for the word Fuck are un true.
 

Some time around 1600, before the term acquired its current meaning, windfucker was an acceptable name for the bird now known as the kestrel.

Shakespeare would use the term but never explicitly.  In several of his plays he would use the word firk, a euphemism for Fuck, which means to strike.

Fuck has its first appearance in the Oxford English Dictionary (along with the word cunt) in 1972.

In my opinion Fuck is not an offensive profanity.  It is only offense if pun is intended.  Sticking with that logic, any word can be used offensively or in kindness.  The true offensive profanity that exists in modern culture are the societal taboos placed upon words that fearful religious peons have used for their own selfish ill tutored reasons.  The bible does not depict any particular word as a "swear word".

Sources:
http://en.wikipedia.org/wiki/Fuck
http://www.urbandictionary.com/define.php?term=F.U.C.K.
 

Say it loud and say it proud... FUCK  (Just don't say it so much that others think you are vocabulary impaired and then go crediting my website for sounding like a moron)