It happens a lot more than anyone would suspect, it's the dirty secret of education, and no matter how many in-services they sit through, some people are going to fool around with the kids. Really true with the young teachers right out of school, and believe me I have seen Jr/Sr gals basically throwing themselves at new male teachers.
This has always been happening, the difference now is with social media, the police now have a paper trail to follow back to the teacher instead of the old it's her word vs his word. Lock them all up, their actions shine a horrible light on all teachers and education in general.
We had a teacher marry a former student at our high school. I’m sure they didn’t start a relationship until after graduation, right?