If you’re aware of a technical solution that could limit questionable sites to those that merely expose “boobies,” I would certainly be interested in learning more. My concern is more that he stumbles upon Raven, Starfire, and Beast Boy in a threesome scene that ends when Beast Boy is knocked out by a tentacle creature with rapey intentions towards the two female Teen Titans.
More generally, I am convinced that at 12, it’s still appropriate to sharply limit his unfettered access to the Internet, because the questionable material that is available is not “boobies.”
I understand that you, personally, would not be as concerned as I, and of course that’s your privilege to apply to your children.