Maybe he makes bad and mildly inappropriate jokes about things being kinky in the classroom, too, and that makes the girls think he's open to a little sexual grade persuasion...?
But that was why I liked that wedding scene with Hippolyta, that she listed those 'greater guy than usual great guy' aspects of him.
Which unfortunately, he seems to be a little too touched by. Note to Terry: when your newlywed wife shows up in her culture's version of sexy lingerie, do not say "you remind me of your mother."