I'm surprised if he was autistic that he would have, or would want to have sex with another individual. Most autistics are adverse to being touched. I don't think they would like the whole warm, moist, smell thing involving sex, nor the emotional involvement. I work with a few kids who have ausbergers , and I can't imagine them engaging in sex. They are not social individuals at all.
I too am impressed by the number of female teachers having sex with their much younger male students. I've tried that a number of times at my junior high school with our cute male students, and I always receive some sort of reprimand. It's all so tiring. Back to reality, it just seems so ridiculously outrageous! As for his being TB, he has much greater problems than that if he's autistic.