The reality is that is little genuine need to expose young children to anything remotely resembling sexually explicit materiel. The knowledge of loving relationships should be shared with young children by their adult family members with whom they coexist in these loving relationships. Discussions about sexually-related topics can and should be handled in this forum, not in the classroom. Schools should only be interested in explaining the reproductive nature of intimate human relations, not exposing children to the sex act for the sake of telling prurient stories or promoting some morally and legally questionable behavior.
I fell it is very relevant for parents to have a role in understanding and approving any sexually explicit materiel that teachers are considering introducing to students who likely lack the maturity to handle in a socially responsible way. I support efforts like this to vet access to such materiel by parents who are paying for their children's public education and should get some say in the matter, rather than entrust such decisions to unaccountable state and county public servants.