If I were arbitrating this trial, I would (at the very least) place the burden of proof on the state. Were the state able to prove that the girl suffered harm because of the parents' open sex practices, I might consider convicting them. That said, it seems exceedingly unlikely that any articulable harm was done. It's weird, it sounds like a bad idea to me, and I am certainly glad my parents never did such a thing. Even so, I think the parents were probably entirely within their rights to show their daughter the mechanics of sex.
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The peculiar evil of silencing the expression of an opinion is, that it is robbing the human race; posterity as well as the existing generation; those who dissent from the opinion, still more than those who hold it. If the opinion is right, they are deprived of the opportunity of exchanging error for truth: if wrong, they lose, what is almost as great a benefit, the clearer perception and livelier impression of truth, produced by its collision with error. ~John Stuart Mill, On Liberty
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