Arfonious said:
Why is violence so accepted in media and society in general when sex and nudity is not?
I mean violence is an alomst objetively bad thing while sex is a necessary and good thing.
Puritan settlers for starters.
Recall your American history. How were the first groups to settle the USA? Oppressed religious groups, which at that time meant extreme Christian groups, like the Puritans. They were groups that were very "anti sex" and were unwelcome in Europe.
All this has led to a strange sort of trickle-down effect where even non-Christian intellectuals in the USA are often uncomfortable with sex. Sex ends up being hidden and taboo - people like porn, but hide it and you can't talk about sex in casual conversation. Or, if you do, it tends to be insulated in some way - like "girl talk" or "guy talk" where only members of a single gender talk together about the opposite gender.
American society seems to getting better in past several decades, but it is a fairly recent and fairly slow process to change 300+ years of American social norms. It doesn't help that England's Victorian era did much the same thing to England's take on sex (although for a shorter period of time - and they seem to be recovering faster than us, probably because the era didn't last as long), and England is the main cultural exchange with America lately due to the language being the same.
So yeah, to get back to your question, the lack of sex is caused by outdated social norms which were in turn caused by various cultural and religious issues of the past 200-400 years. As to why violence is okay, let's look back at those same Puritan settlers.
They were in the process of taking the land of the Native Americans at that time. How did they conquer America? Violence. They used guns. They killed the Native Americans and those that they didn't kill they pushed further and further West.
So those Puritans were anti-sex, but they needed violence to survive. Later, those same settlers used Violence to rebel against England and free themselves, founding the USA. America was built out of violence, which was further glorified by the by WW1 and WW2 (neither of which took place on American soil, and both of which America was the winning side of).
Thus, in the American culture, sex is viewed as bad (thanks to the Puritans) and violence is viewed as good (thanks to a history of war, particularly Victorious war during the World Wars and the Revolutionary War).
