Classic movies were much better. They concentrated on good stories. They didn't have to resort to this.
Sometimes I think doing away with the Hayes office (an organization which forbade nastiness and filth in movies) was a bad idea.)
Today's movies have contributed greatly to the decline of moral standards in America today
Are there such movies made today? Sure...but they're not the most popular ones. As I pointed out, none of the top 20 films of the 2010's have graphic sex, graphic violence, or (as you put it) unspeakable language.
Today, nobody can write a decent script, the actors and actresses can't act their way out of wet paper bags, and there is far to much CGI crap.
Also, when talkies were newish, though some adult situations were used, there wasn't graphic sex scenes and there wasn't any blatant bad language...though lots of innuendos.
OTOH...even without ratings, people did NOT take nor allow kids to see adult themed movies!
Today? Even some G movies are absolutely NOT for children!