You're right, but that doesn't mean there wasn't still a period of time Wonder Woman's boobs wasn't still treated like it was obscene and legally banned. That's what the Comics Code was. It was a period of time IIRC from the 50-70s where what you could do in comics was heavily restricted to the point of insanity because someone in power seriously thought Wonder Woman having cleavage was obscenity.
That's what I mean with what legally counts as pornography/obscenity being something notoriously tricky from a legal standpoint. There are people in the past that seriously thought that included Wonder Woman having cleavage and used it to heavily censor comics for decades.
I would hope anyone with half a brain would realize Wonder Woman's cleavage isn't obscene, unfortunately we know from history there are people who think otherwise who sometimes get power to control what can and cant be published.