Can somebody help?

I remember seeing this film, years and years ago when I was just a child, and I am sure I remember witnessing a particular scene where a male teacher (who, as far as I can remember, looked well into his 30's!) asks a young girl in her very early teens to take all her clothes off! I'm pretty sure it was this film, and the scene in question took place in somekind of woodland area (the girl, if memory serves, was stood against a tree!). Did I actually see such a thing or is my memory, almost seventeen years on, playing tricks on me?