Matthew Almodovar likes holding his girlfriend's hand during lunch or when they're walking to class. But at Culver City Middle School, that display of affection could land the couple in trouble. At the only public middle school in Culver City, it is against school policy for students to hold hands, hug or kiss on campus. Perhaps more important, the "no contact" rule also prohibits students from hitting, shoving or pushing classmates. Schools nationwide have policies to prevent violence and sexual harassment, but some go further — such as creating a rule against touching. In March, one middle school student in...