Over the past few years, I made the decision to totally cut obscenities out from my speech. You might actually be able to find recordings of me cursing four or five years ago, but as of now, I really stand by my decision.
Obscenities are the linguistic equivalent of an trashy emaciated person entirely decked in tattoos, smoking cigarettes and wearing a shirt with nudity on it. They'll defend what they do on the idea that it's someone "their right," or "expression," as if they do what they do for some lofty philosophical reason. What everyone else sees is a person who is not in control of themselves or their vices, in fact, someone who views their vices as a good thing.
There's the atomistic and nihilistic tendency to give an "intellectual" argument for obscenities: "What's so special," the argument goes, "about obscenities in English? They're just a combination of arbitrary sounds! They don't have some objective magical harm in them."
But the "arbitrary sounds" in an obscenity do indeed have a special place in human psychology. Obscenities are produced and processed in the brain quite differently from non-obscene language, involving the more animalistic/reptilian parts of the brain. When assembling a well-thought out case, there is really never a temptation to litter it with curses.