The “seven dirty words” are seven English-language words that comedian George Carlin first listed in 1972 in his monologue Seven Words You Can Never Say on Television. At the time, the words were considered highly inappropriate and unsuitable for broadcast on public airwaves in the United States. As such, they were avoided in scripted material, and bleep-censored in the rare cases in which they were used; broadcast standards differ throughout the world, then and now, although most of the words on Carlin’s original list remain taboo on American broadcast television as of 2010.

It is almost as hard to imagine Christ telling a parable to tax collectors and prostitutes as it is to imagine him doing so without curse words.  They are a part of our social fabric as humans: the real world, the factual world, the world in which we and our children function. They are important to developing real world characters with which children can identify. There is something wrong with obsessing over many of the things ‘curse’ words refer to, but, it is also wrong to obsess over money, music, freedom, or just about anything.

Often words are segregated according to the people who use them: their class, race, religion, education, and so on — in themselves most have no inherently crude or disturbing meaning.  They are used to divide and stigmatize, domesticate and rule.  Meanwhile unspeakable evils are plotted with ‘acceptable’ words. To a certain extent over-reliance upon curse words for adding emphasis indicates a lack of imagination, but so does avoiding them altogether in order to white-wash a story or character.

http://en.wikipedia.org/wiki/Seven_dirty_words