If you believe this was unheard of, you're living in another world. It went on but either was handled outside the purview of the public - daddy beat that ass or the principal moved the teacher around, like Boy Scout pedophile leaders and Catholic priest pedophiles being moved around - or people didn't learn about it.

I had a friend who was screwing a teacher's wife when we were in school. I knew of another teacher who was, in today's kids' parlance, a creeper. Just too weird, and he eventually got in trouble.

That was in the early 80s. This kind of stuff has been going on a long time. Cable news and social media just make it more publicly known now.