I'm guessing you are old enough to remember all the way back to the 90s.
In any case, there is a difference between sex and porn. When I was a teen, you were supposed to at least pretend you cared about the girl. Now, as best as I can tell, they prefer it if you don't.
Nah, the 70s.
More drugs, less lite bondage.
Most of human history is not as prudish as American Old-Fart-ism.
I was a teen in the late 70's and the local drive-in theatre showed porn on Saturday nights.
Everything old is new again.