I think it's less of an issue of giving into being a "slave to your body", as Trance and Moss put it, and more a situation of just wanting to have some fun. Especially as kids. I can't personally see why there's any issue with going on natural urges since generally what your gut feeling is telling you to do is the most fun thing to do. And don't we all want to have some fun?
I had a great laugh at this. But honestly, that makes me question why we bother hiding anything. Whatever parents and teachers don't tell them, peers will, and as demonstrated here, what peers say is often wrong. Isn't it better to teach the kids this sort of stuff early so that they don't get the wrong information from their peers?