Well a long time ago back in the days of black and white movies you really didn't have any violence or nudity in horror movies and people were still afraid of them. Then once they got used to them movie makers started pushing limits and adding things like sex, nudity, violence, and gore to shock as many people as possible. But nowadays people really aren't bothered by that kind of thing anymore because we see it all the time in movies.
I mean I imagine there will always be some people who still get afraid watching horror movies but I think that for the most part people are too desensitized to really be effected by them anymore.
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