while naked images of kids may not be illegal, i think it crosses the line when someone tries to profit from it, because they know they are appealing to pedophiles. even if the images are nonsexual. by definition a pedophile does not need sexual images to get their jollies.
taking a pic of my kid splashing around in the pool naked is no big deal. but putting it on the net for everyone to see, and charging for it is wrong. same goes for 'nudist' pictures and videos. all those kids naked at a nudist resort and captured film is not wrong or illegal. but the asshole who put them on the web and sells them, is comitting a crime in my eyes.
that is one of the inherent flaws of our government. they are merely trying to define childporn based on content, not on the intention of the photographer.
