Nudity is the WORST!

An article HERE shows how a game with sex is removed promptly from Steam.

"We submitted the game on Thursday, when Steam Greenlight launched," explained Miriam Bellard, co-founder No Reply Games, "but they took it down almost straight away. Many people still view games as 'for children' in spite of the fact that
the average gamer is 30 years old. The gaming establishment is fine with violence and gore but is uncomfortable with sexual themes."

Sounds true to me. I just don't understand what's going through people's heads. We can dismember people's head and watch them bleed from where there head once was, and get a M rating. Have a non-violent game with sex, then it's Adults Only. Pathetic.

"I think it's traditionally a religious mentality, that is that sex is more crude than violence. More fundamental Christians have always demonized sex, but have not historically been that way about violence. They were always okay with burning and stoning heretics. Even though things aren't like this anymore (at least in western culture), that view that sex is dirty, improper or vile has still carried over to the modern day. When you think about it, it really is a bizarre stance. How could it be that a nipple is more offensive? How is it that something we all inherently do or desire be so frowned upon? Something that is fairly harmless too, especially when consensual! We live in really strange society."

I guess my question is why the human body without clothes on is deemed as offensive. What exactly is so mature about the human form that warrant AO rating?