Look no further than 16-year-old in the 1999 film American Beauty.
That's much too young for 1972 and far, far too young for today's audiences.
When she's about to sleep with one of the guys, the young girl passes out drunk and topless.
One way that Return to the Blue Lagoon managed to get away from underage scandals was to keep all the nude scenes distant from the intimate scenes.
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She has done a lot of sex scenes in her career.