Historically speaking, Up until VERY recently, some nudity, even in public was completely acceptable.
Whatever! And as far as your other comment - notice the nudity you are describing is children being innocent and young - not mature adults running around in the buff and exposing themselves to the eyes of the young.
You notice also that many of you have said I shelter my child - what do I do exactly that you would consider being sheltered? Just because we do not have television? Don't you worry about what my child will know and not know Machine - it truly is none of your concern.
I can assure however, he will not be taught that anything goes. He is being taught that even ideas have consequences and that in choosing a woman - to choose not only by "looks", but more importantly, by her character. He will also be taught the beauty of the gift the Lord has given to be between a husband and a wife and not the cheap way the world likes to portray sex.