I have a different theory as to what motivates these "people" (There are women predators as teachers, etc. also). I believe that most were 'nerds' in Middle/or High School and now, finding themselves in a position of power, seeing those 'same' girls (or boys) that wouldn't even talk to him as a middle/high schooler, and finally having access. The most dangerous person is someone who was made to feel inferior...and is now in a position of power. The temptation is too great.