May I take exception, please?
I assume you really mean the "inappropriate" use of profanity or explicitly adult language. My own slang web site naturally contains profanity, is not an adult site, but nor is the profanity gratuitous - it is merely defined.
Within literature and art, profanity can add impact. I remember reading a poem when I was young, suddenly out of nowhere the narrative refered to his emotions being told to "F**** off!", it added creative and artistic impact.
The inappropriate or gratuitous use of profanity, I agree is totally unneccessary and lowers the value of a piece of work.