It usually starts with a pro-gay club like the gay-straight alliance. These clubs are associated with GLSEN, a national pro-gay organization aimed at promoting homosexuality in the schhols. If a school refuses to allow the club in their school, then they get sued. So they usually do it. Then you get the other stuff: day of silence, anti-bulling programs (front programs to promote homosexuality), posters and assemblies and on and on.
All of which is facilitated by the ACLU.
As a mother and former teacher I regard all this sex ed as child abuse.
Anti-bullying programs are a completely different ball of wax. I whole-heartedly support anti-bullying programs.