Reminded of how the first film role for veteran British character actress Helen Mirren was playing a naked 17 year old in a film called, er, Age of Consent. https://www.imdb.com/title/tt0063991/ ; she was 24.

This kind of thing happened a lot, and I think more than one entirely "mainstream" director in the 60s/70s filmed nude actresses below the age of 18. Fortunately it's a lot harder to get away with that these days. Not to mention (Weinstein and many, many others) sexually assaulting the actresses off screen.