Here’s some NY Times:
"…Cursing, they say, is a human universal. Every language, dialect or patois ever studied, living or dead, spoken by millions or by a small tribe, turns out to have its share of forbidden speech, some variant on comedian George Carlin’s famous list of the seven dirty words that are not supposed to be uttered on radio or television.
Young children will memorize the illicit inventory long before they can grasp its sense, said John McWhorter, a scholar of linguistics at the Manhattan Institute and the author of “The Power of Babel,” and literary giants have always constructed their art on its spine.
"The Jacobean dramatist Ben Jonson peppered his plays with fackings and “peremptorie Asses,”
… In fact, said Guy Deutscher, a linguist at the University of Leiden in the Netherlands and the author of “The Unfolding of Language: An Evolutionary Tour of Mankind’s Greatest Invention,” the earliest writings, which date from 5,000 years ago, include their share of off-color descriptions of the human form and its ever-colorful functions. And the written record is merely a reflection of an oral tradition that Dr. Deutscher and many other psychologists and evolutionary linguists suspect dates from the rise of the human larynx, if not before."
As for frequency, I think the assumption that swearing is worse today basically stems from our growing up. People are prone to idealize the past; The long hot summers, the snowy Christmases… the clear blue skies of out chilhood are most likely idealized recreations of reality; I know for a fact that most things are better today than they have ever been in history, still, I cannot shake the feeling that the world was a better place when I was younger. sigh I’m getting old.
Also as we grow up, we’re also taking an adult role where we no longer need to be “protected” from profanity. I did some work on a roof with my father, dropping a box of nails earned a heartfelt “mothe#%&!” from him… something I probably wouldn’t have heard a couple of decades ago… not because he’s turned curmudgeon (well, a bit… but still) since his retirement, but simply because I’m no longer a child.
It’s possible there’s a desensitization process going on; The Beatles were thought to be a corrupting influence on the youth… then came punk, heavy metal, gangster rap… Songs on the radio today would’ve shocked people nearly to death just 50 years ago. Words that held a shock value to the older generation might have become commonplace for the younger.
Some words go through the opposite process; “retard” for example was originally a value neutral diagnostic term… yet it’s currently used almost exclusively as a derogatory. There’s also a “Gropec*** Lane”… apparently the big C-word wasn’t at one time considered too offensive to be a street name. “Faggot” used to mean “bundle of sticks”…and I’m sure nobody really feels too strongly hearing “Zounds, ye fat paunch, an ye call me coward, by the Lord, I’ll stab thee.” in Henry IV… to modernize a bit “Jesus Christ, you fatass, and you call me a coward, I’ll stab you.”. Languages change over time.
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Then again, what would I know; English is my third language 