My parents took some pictures of me when I was pretty young and it was harmless. But at about age 12 I felt really weird about those old pics and I asked them to burn them. Mom wasn't happy but she did burn them. It just seemed weird.
I've been to a nudist camp. While guys aren't walking around aroused there is a lot of checking out of the women. If a person was turned on by children I'm sure they would be checking out the kids.
I believe the law in CA states that it's not considered porn if a naked photo of a child is a member of the immediate family.
For those members of Nambla a naked photo of a little boy would be softcore porn at the least. So I would say that what is art to one person is just another excuse to masturbate to someone else.