Writers: When do you use profanity in writing?

I'm working on an essay, and I'm at a section where I'm yelling at my boyfriend for doing something stupid and I'm waffling between putting down what I really said ("You better cut this shit out"), and making it nicer ("You better cut this out.")

Eventually I'd like to submit this essay to a major newspaper so I'll take out the profanity, but I was just curious if you other writers have policies on how much profanity you use in your writing--as much as you want? Just for effect? None at all?

Obviously, if you're writing for the New York Times, you're not going to be dropping f-bombs in your pieces, but how about for your fiction, creative nonfiction, essays, blogs, plays, screenplays?

Want to see what other writers have to say on the topic? F*@k yeah you do.