As much as I am inclined to agree with you on this one, it isn't as simple as telling the school administration that you have been having sex with your teacher. Your face is going t obe all over the news for having had sex with your teacher. People will be talking about you (Whether saying "Nice bro!" or "You sick bastard" or "You poor thing) when you really don't want the attention (for that reason).
I believe you read my post wrong. I was trying to say that if a persons teacher does make attempts to lead them to anything sexual they have the option of reporting the teacher or rejecting sexual requests before an issue occurs. For example, say a teacher tries to convince a student that they will fail them if they don't have sex. The student doesn't have to comply to having sex with the teacher. They'd probably be better off speaking to the school board, etc about the issue so that they can take whatever steps are necessary to protect the student.