Were movies more unrealistic in the earlier days of film?

[Jasonic]

Now I'm not talking about Sci Fi, Fantasy, Super Heroes, Monster horror flicks or whatever. I'm talking about more so how they are portrayed. The lifestyle, the people, or the morality if you will.
There isn't anyone much more offended by "immorality" than my mother. I use quotations because who is to say what is really immoral. But never mind philosophy for a second. She loves to watch the channel TCM, where its movies mainly from the 30s, 40s, 50s. And she constantly likes to bring up that "they just don't make good movies anymore." Though how would she know when she basically won't see anything above a "PG" rated movie. And thus we get into many arguments, as movies are my highest passion and pretty much none of that passion comes from the eras where she likes movies, save for some of the really good ones here and there. I obviously couldn't be anymore different, as theres really hardly a thing that offends me. Then she goes on to say how unrealistic movies are these days, which I don't really feel it had anything to do with our arguments, but it got me thinking.
I was born in 1990, so I don't really have much to go on other than media to how things really were in "the old days."
Was it because no one used swear words back in those days that you don't hear much of any from older films, and as to why they generally restricted the use of them. It's a definite that words such as the F-word weren't generally used back then.
Is there a comparison though? Were there other words that could of been considered back then to be just as vulgar? When Gone With the Wind came out it was pretty iconic and shocking when "damn" was used in the iconic phrase.
What about in modern historical movies? Like Centurion I recently just watched? The F-word was used often in there. Did it even exist at such a time, or could it be said that it is simply in use in replacement of whatever vulgar words were of the time?
Then of course there is the aspect of sex and violence. Those are nothing new to modern society, obviously. So does that aspect just as much make earlier films unrealistic for the fact of nearly never portraying such things as sex, profanity, and violence? Or were the earlier days of the previous century really just a more "clean cut" society if you will?