well here i go with my little story...
you see, fuck is not a word, in fact, its an acronym. F.U.C.K.
this was back in the medieval times when there was an empire and a king and queen. the people of the town had love at that time as well. now you see, having sex back then wasnt as much casual as it is today. so as the townsfolk wanted to fornicate, the had to approch the king for premission to grant them the time to fornicate. so once the king granted them the time to fornicate, they had to go in this room and put a sign up on the door that said "F.U.C.K." which basically meant, "Fornication Under Consent of the King"
ergo, the origination of the word "fuck" ^.^