http://youreteachingourchildrenwhat.org/sexuality-education-family-impact/
http://www.truetolerance.org/2012/parents-bill-of-rights-for-public-schools/
palo alto parents case:
https://www.change.org/p/replace-the-current-sex-ed-curriculum-used-in-palo-alto
https://www.paloaltoonline.com/news/2017/04/14/palo-alto-parents-protest-new-sex-ed-curriculum