American Network TV-specific, Anon. “Fuck” gets used in quite innocuous contexts in Australia. Such as Gogglebox Australia, a show showing couch potatoes yelling at Reality TV shows. (And only the Real Housewives of Melbourne say “fuck” unbleeped.) And in the States, there’s lots of profanity on HBO shows.
Walking Dead is cable too, but I don’t know enough about AMC to know why they didn’t follow Game of Thrones in profanity.
Different cultures have different taboos, different attitudes to taboo-breaking, and different consensuses around taboos. With regards to sexual profanity, there is a prudish mainstream in the US, and a libertine undercurrent. Blasphemy is (somewhat surprisingly) not a thing in the US any more, although the swearing in Deadwood is an attempt to emulate erstwhile taboo-breaking. America has evolved a whole new suite of taboos around racism (“N-word”). And so on.
It’s well known though, and a recurrent source of commentary, that the US mass media has more taboos about sex than about violence.