Uhhh..

Sounds like the guy wanted to 'educate' these kids a little, get them use to the idea of bukkake and whatnot and then once a few 'choice' students had viewed sites with young looking 1st timer girls giving blowjobs and doing anal, he could then convince some of the naive in his class and make a similar move.

If I was a parent of any of the students in that class, I would have simply paid him a visit and broken his jaw with a roll of quarters in my rolled up fist.