[Superman]

In fact, I'll bet that the parents' existing rights here include the authority to keep the child in the school, but not expose them to the sex education courses or material or research/testing. I'd guess that if any parent went to a Principal and said "I'm comfortable having my child in your school generally, but not comfortable with the sex education and research. I will teach that at home. Please excuse my child from those courses." I'd bet the answer would be "okay."