They didn't go strip for money, they went to watch a campy strip show, which is exactly what Chippendale's is, whether they take themselves seriously or not. Women dancing naked may be sexy, but men in speedos and bow ties dancing around is just plain funny. They didn't take pictures and show the kids, they didn't go home with the strippers, they just went to a show and had fun. I don't have any problem with that at all. Perhaps this guy didn't show the greatest judgement, but it sounds like the teachers had themselves a good time, which improved their morale, which can only make them better teachers, not worse.
It will never make them better teachers in the positive sense.
The old corrupt the young and the nation continues onward to Sodom and Gomorrah.
Of course they didn't go strip for money, but according to your logic, what would be wrong if they did (as long as they meet your bottom line of "improving the morale of others")?
Or, according to your thinking, men in speedos and bow ties dancing around is just plain funny...then I suppose you see nothing wrong with male educators who go out & earn some extra income "improving the morale" of female voyeurs. After all, they wouldn't be doing anything sexy. It would just be a "funny" act. And what could possibly be wrong with educators who moon-light as comedians?