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I agree with whoever said the boundary violator needs to be confronted and possibly asked to leave.
I had a boundary violating professor in grad school. He just HAD to tell the class whether or not his wife was giving him any that week. He never understood why students complained to the administration. The man was beyond having a clue about boundaries between teachers and students.
Some people just are, I guess. Those kinds of people should be kept away from teenagers, especially when it comes to sex education.