Just imagine if the genders in this film were reversed the people hailing it would be condemning it as a excuse for rape.
And we are seeing rape portrayed here. While 16 maybe the age of consent in many countries, in EVERY developed country there is a specific exclusion of consent if the adult involved is a teacher or person with supervisory/"en loco parentis" role, ie a teacher etc.
this film actually blames the young man who is a rape victim.