unless you are logged in, images flagged as adult content won't appear, and even if you are logged in you need to have a certain check box marked.
that takes care of DD's and "popular", but not "newest"
i'd imagine most people's problems with nudity on dA comes from when the author doesn't check the box for "adult content" and it shows up in the "newest" channel, but there's surely a lot of viewers that say "hells yeah lets see that nudity, i don't want my dA censored", but there's no one to remind them "be careful what you wish for". lol
as far as kids go though, there are parental controls. yet sure, the kid can make their own account to bypass the security, but they can also click on that domain bar and go to a site that's really "neat". you can't save people from themselves, and dA does have standards by which they allow nudity. they are more concerned with "is it sexual", "is it pornographic" rather than is it just "graphic".
you'll still have crotch shot terrorists looking for thrills by shock factor come by time to time, but that could happen here just the same if one of our journeymen felt so inclined to give us a farewell to remember, or someone went on our forums and made a thread called "hey look at this, it's funny". though correct me if i'm wrong, while it might be rare as hell, there is nudity on wincustomize as well is there not?
nothing will ever be perfect or make everyone happy, but considering dA has no intention of telling people "your art isn't good enough" and since they believe "art needs no working value, practicality, or quality standards set by individuals in order to enjoy or appreciate it", and that dA is truly an art for art's sake community, it's quite different than maxstyles, wincustomize, or any other applied arts.
you can call anything art, but the sole definition of art, the only thing necessary for anything to be art is merely in its creator's "intention". whether people see their dentists as being artists, or see nudity as not being artistic is entirely beyond the point.
a toilet can be a piece of art, but that doesn't make all other toilets in the world art as well, and that is the point. it's not the subject matter, or the appeal others find in something that validates it.
personally i have no care to see dA carefully scrutinized each submission piece by piece, or exercise fig leaf protocol, and thankfully neither do they.