Ono -- given the way the public school system is set up, my best guess would be that it varies from one school district to the next. And part of that power is wielded by those who serve on their local school boards.

Which, when you think about it, is really scary -- since that gives individual educators an inordinate amount of power and leeway, as far as sexual/content education curriculums...and, depending on the teacher, they can use their authority and influence for either good or evil.

I don't work in adolescent education, so I can only go by my own experiences in middle school -- and my school's sex ed curriculum was oppressively heteronormative.