I'm with Harvs. It's a very fine line. On one hand, a persons profession shouldn't impact on how they choose to spend their down time.
On the other hand, it completely does impact and teachers need to be aware that the choices they make can come back and bite them on the bum.
Things have come a long way since 1923 when teachers would have to sign a contract like this:
(Thankfully! And also you will notice it only mentions beer, wine and whiskey. Vodka or Rum is obviously ok ) and schools no longer have a say in how a teacher behaves or dresses outside of school hours. But, the teachers are kidding themselves if they believe the parents will never find out what they get up to- especially if its illegal or highly risky behaviour.
As for the guy who she sent the nude photos too, he deserves a massive boot up the butt. What he is doing is NOT ok and should be held accountable by all his mates. What an A-hole.