It’s also likely that any interest he developed in an inappropriate direction might well be a temporary thing. Between the complexity of posing, and the limitations of the stock female figures (unless he renders only males), doing good explicit erotic work (as opposed to say pinups) is probably a lot harder than ‘regular art.’ He’d probably get frustrated pretty quickly at not being able to come close to what he’s seen and move on. OTOH, if he has the patience and determination to keep at it then, as I said before, at least he might end up being good at it. Whether that would be a bad thing is a matter of opinion.

"I guess it all depends on how hung up you are about nudity.  I'd let my kids use it at any age, without a second thought."

Yeah, but you guys let your convicts carry lighters :-) Seriously though I’d probably agree with the caveat that I’d be extremely worried/careful that their little friends didn’t see it, that they didn’t talk about it… I would not be at all surprised if someone here (USA) got a visit from Child Protective Services and maybe worse over a naked Vickie – complete with blaring headlines about ‘8 year olds exposed to pornography.’

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken