In fact that was the basis for the Movie "Child Bride" which skirted the Hays Office for many years, because they made it as an 'Educational Movie'; about on the same order as "Fox News: fair and Balanced". It had several scenes in which the actress who was 12 years old, was seen in the nude, including an upper, frontal nudity with nipples.

Yeah, you mentioned that one before and it is available on Youtube. It may have been "sanitised" over the years because the one on YT has her breasts covered by trees except for one brief scene. I found even that version somewhat "iffy" because of the too-long "nude swimming" scene. You were right, too, about it being loosely veiled as an "anti- child marriage" shock educational film. It is quite obviously no such thing. If it were, there would have been no need for the gratuitous nudity.