I'm sorry, I've taught in Japanese high schools and junior high schools before, on two separate islands, and that does not match my experience at all. Japanese boys are extremely sexual and love to do things that in America would get a student automatically expelled. The girls, as innocent as they might act, are no angels. I've had wealthy students, coming from the best schools in their area, tell me truly bizarre things and ask me incredibly rude sexual questions.
I think these were either the best of the best, most serious students or they just wanted to keep up a good face in front of the foreigners. The average Japanese person, once you get under their shell, is very sexual.