I will put my two cents in here, if i may. I agree with those who say that the teacher was showing, a
total lack of judgement, and if not otherwise, disregarding what she had to have known was a movie that would have not been approved by the authorities. Otherwise she would not have made such a disclaimer, as "close the doors, or : what is in this class stays in this class." The least of what she can be charged with is stupidity, and otherwise outright disobedience of policy.
Now having said all that, I think in my opinion, the sex was the least likely to be traumatizing in this movie.
The graphic murder scene being the most shocking, and probably the most damaging. Secondly all the knowledge of lies and deceit, and affairs...Lastly without a guidance to children of this age, never mind the lasting damage in fear that could be visited on a young child. To me this was on a par, although a movie, is not the same as real life. It is a lot like what is done to Ennis when he was a child....
Can you imagine how one of those children having not been given good guidance, before...if they might be grappling with the gender identification problem...ie, lesbianism, gay or such....DEVASTATING........