Here we go again. So the posters here would be OK with a teacher coming onto and having sex with your teenage son? You’d pat him on the back and congratulate him for “getting some”?
Since this kid was 18, the teacher shouldn’t be jailed, but she definitely should be fired and banned from teaching.
I think that, between "banal" posts, that is sort of the upshot. 2 adults having sex, irrespective of their relationship to each other, should be no business of The State, other than The State as employer.