Parents at an elite private school in Manhattan are furious to learn that their children had been shown sex-ed video clips explaining the concept of masturbation and why their family members should not touch them without consent, a new report says. First-grade students at Dalton School, an institution with a price tag of about $50,000 per year, watched clips from the animated series AMAZE during a sex-ed lesson last fall, according to the New York Post. The lessons were taught by Dalton’s director of health and wellness, Justine Ang Fonte, who has recently faced criticism for teaching an explicit “pornography literacy” course to junior students at the Colombia Grammar & Preparatory School nearby. Parents took issue with Fonte’s graphic lesson about self-touching. She reportedly assured parents that the idea was teaching kids not to touch themselves in public, and that she didn’t use the word “masturbation.” Some parents also took …