I gave it lots of thought, and this is my conclusion so far. I'll start with porn because it's more obvious: its one and only purpose is to arouse people. It feeds from the basic human lust. Some people fight this urge, some people accept it, both are fine. Some get addicted which is not so fine, but same happens with alcohol, drugs, etc. You can't blame the industry.
Now for the less obvious, which are the nude/sex scenes in TV shows and "normal" movies, i.e. not porn. First of all, those are **not** meant to arouse. It's actual part of the TV show or movie, and meant to make the show more…