I do not necessarily think those things promote violence,however,they CAN if they become common place and are seen as something the average person is doing.
Many people don’t have the ability to separate fantasy from reality.Especially younger,more impressive people.And despite laws against underage viewing,porn still manages to get into the hands of young people.
The internet makes it way too accessible.

Porn should have rules and should be respectful,because it is setting an example.
It need not be puritanical,but as I mentioned,
violence in any form should be banned and words like “slut,whore,bitch,etc” should also be banned due to their offensive nature.