Janet Jackson. Ok, so it wasn't appropriate, but what is the big deal really?
Women have breasts. The function of breasts is you feed your young:
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mam·mal
n.
Any of various warm-blooded vertebrate animals of the class Mammalia, including humans, characterized by a covering of hair on the skin and, in the female, milk-producing mammary glands for nourishing the young.
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Your children should know this - it's a simple fact of life. I don't know why they wouldn't know - that's is far more disturbing to me.
America, please stop sexualizing everything - breasts are not a big deal.