For example [vaguely]: writer creates a character who behaves like X, despite nobody actually behaving like X in real life. Then characters behaving like X become a wide-ranging trope. People in the real world begin to think it’s normal to behave like X, and subsequently start actually behaving like X themselves.
Any actual examples of this phenomenon happening?
https://ithy.com/article/anal-sex-origin-6hhdemse
Tap for TL;DR
It’s been popular for thousands of years. You can even see it in the Kama Sutra. Then, in three mediaeval era, it was “sinful” and taboo due to various popular religions; mostly in western regions. Then, “recently” (early 1900’s), we decided it might be ok again.