I'm sorry that you just don't see the simple truth, but facts are facts and you can theorize all you want. Your poor grasp of the realitiy of the effects of sexualization on our country's children shows that. Unless you've been there I would venture that you just don't know what you are talking about. Rant all you want. Until you've had your whole life altered by it you have no clue.
The U.S. might culturally have hangs up about sex, but child prostitution/pornography happens in other countries far more often than it does here. Worse, child slavery is a growing criminal enterprise in many European, Asian, and African countries. It isn't just societal conditioning we are talking about. These other cultures have far more unrestrained sexuality in their culture than we do. Many of these cultures you speak of have grave problems with a subculture where children become objects for pleasure. You just refuse to see a large global problem. Not that that is unusual.
The links below are relating to child slavery and child prostitution..they were only 3 out of 158,000 Google results on child slavery and over a million about child prostitution.
Back to the original topic....I don't have a problem with nudity. I do have a problem with much of Koons work (and those like him) being displayed in a public venue. I don't think you see the distinction in your rush to judgement. Again, not that that is unusual.