I disagree with the notion of "dirty" language. Language is for communication. It uses words, and those words have meaning. A lot of people misuse words, and many times give away their lack of cognitive function when the only adjective they know is f*****g. But it isn't inherently dirty. Properly used, profanity can emphasize a point. When I use profanity, 1poorlady knows I'm p-o'd. Because I seldom use it (other than "crap", which used to be a "naughty" word when I was a kid).

I also refer you to Matt 15:11:
"It is not what enters into the mouth that defiles the man, but what proceeds out of the mouth, this defiles the man.” (NASB)

The further context of the chapter refers to a man dishonoring himself, on the premise that this is what is in his heart. (It also nullifies any food restrictions imposed by different sects, since it isn't "what enters into the mouth" that is a problem. But I digress.)