when i taught in lee county, fl, they showed us a list of actions for which we could be fired.
They did a whole 'ethics' thing. it was BS. But some made sense. I don't want a guy who performs as a porn star during summer breaks teaching kindergarten in september. I don't want a chick arrested ten times for crack cocaine purchases teaching pre-school.
You disappoint me . . . and your rational self (I know he is deep in there somewhere).

First, you call their ethics rules “BS” then you ape the rhetoric of the people who peddle the BS.
The guy who makes porn in the summer might be a very effective kindergarten teacher in September. What he does on his own time is none of your business so long as he conducts himself appropriately at work. Our society does not pay teachers enough $$ to tell them what they can and cannot do when school is not in session. Making movies—even porn movies--is perfectly legal.
Barring someone with a (certain kind of) criminal record is a reasonable restriction for a school district to impose, but conflating that with legal behavior that some people may not like is simply daft. The very parents who would move to fire this teacher/actor are the same parents who watch his movies.
Should we fire teachers who smoke? Or drink (too much)? What examples are the children in kindergarten more likely to know about via Mr. Smith’s example? Smoking, drinking, or acting in adult films? If Mr. Smith smokes he likely smells of smoke and every child in his class knows it.