It's never a good thing when the principal is doing porn while at school with the kidos. The guy knows that is not what he should be doing and he is so far out of self control he will risk his job and reputation for his virtual sex obsession.
There is such a thing as sex addicts...meet the principal. He should not be in control of other people's children in his condition and I don't think he'll get it under control with a five day "time-out."
I'll grant the point, however, that it was not the right venue to send the emails.