What planet do you live on, where kids have no sexual inclinations?
Early on, they can be naturally pretty hardcore. It disappears afterwards, commonly from repression by the parents, but that doesn't mean the interest has disappeared.
What kid that is old enough to pay attention to this mostly text based forum isn't old enough to know pathological sexual themes from healthy ones? Are you saying kids of, say, 13 years of age would neither feel indiferent, nor somewhat to very interested in a soft playboy mag left open by mistake for them to see, but actually be corrupted from innocence? That they'd actually feel some sort of trauma?
The only trauma is repression void of understanding.
Kids' first encounters with sex (let's say their parents, as most of the time) can be a bit shocking because of the (from the kid's point of view) relatively aggressive latent vibes.. but that is to passive sexual (and even that's subjective) items what the mousetrap is to the piece of cheese.
The piece of cheese is harmless. It should either attract or leave indifferent, but if the kid gets upset at seeing it.. then he's the one with issues.