Whilst I don’t have a link to a peer-reviewed study or anything like that, it’s been my overwhelming experience (both online and through my travels) that American society has a curious problem with swear-words.
Often, the complaints levelled against popular movies and music include things like “There’s too much swearing/cussing in it”, and even here on the boards you see a lot of people (presumably adults) asterisking or blanking out letters of swear words, as if pretending that typing “F**k” isn’t the same thing as typing “Fuck” (Shocked gasps from the audience; A woman in the front row faints).
Now, as someone not from the US, I’ve always found this attitude a bit strange. Sure, nearly everyone agrees that swear words are best not thrown around in the presence of the Archbishop of Canterbury or kindly old Mr. Patel from the corner store, but most adults are familiar with swear-words and unless they’re living in Pleasantville c. 1954, really shouldn’t be that shocked by people using them.
Even if we take “Cunt” (Angry hubub from audience, parents cover their children’s ears, a Minister brandishes a Bible; someone else faints and their friends try to rouse them with smelling salts), in the UK and Australia (and NZ, to a slightly lesser extent) it’s not the Hydrogen Bomb of Swear Words. Again, it’s not a word you’d be advised to use incautiously around your grandparents, but calling your friends a “cunt” is (depending on context) usually meant in a jocular, friendly manner. In most cases, it’s harmless or only conveys a sense of mild annoyance even when applied to strangers (“Some cunt on a bike is holding up traffic all along the road”, for example).
Obviously, Australia and other countries have different attitudes towards swearing in general- swear-words are broadcast on free-to-air TV after about 8:30pm (The Pacific, for example, had all the "Fuck"s left in it), which doesn’t happen in the US.
What I’m interested in is why modern US society seems to have such an issue with swear-words when the UK, Australia, and New Zealand don’t.