"Pubic region" is the key word. If they use common nudie magazine techniques of focusing on their vag areas, and the kid is wearing adult lingerie (thong, see through, etc.) then it is lascivious. Of course, I haven't seen the sites so I can't make TOO strong a case, but there is definately a line that can be drawn before nudity. And maybe I haven't watched enough tween programing, but I'm pretty sure that it will show them in pajama bottoms and not thongs (unless it is skeezy and showing the thong outside the clothes style).