I'm a few years younger than her, so don't remember Pretty Baby coming out, but I do remember people questioning the Calvin Klein ads. I'm not disagreeing with your point - but it makes it worse that there were dissenting voices, but they were dismissed.
It is also absolutely gob-smacking that Playboy, which traded on its 'respectable, intellectual porn for gentlemen' image (total bollocks, obviously, but that's how it promoted itself) published full nudes of a 10 year old.