There is also the influence of the church.

I have seen religious parents been vocally opposed to their children seeing or even discussing anything related to sexuality.

An example from the past:

"The National Legion of Decency, also known as the Catholic Legion of Decency, was an American Catholic group founded in 1934 by the Archbishop of Cincinnati, John T. McNicholas, as an organization dedicated to identifying objectionable content in motion pictures on behalf of Catholic audiences."

https://en.wikipedia.org/wiki/Legion_of_Decency

https://www.archbalt.org/catholicism-influenced-moviemaking-...