Unfortunately, organizations like GLSEN are welcome at many public schools.
http://www.freerepublic.com/focus/f-news/1026551/posts?page=408#408
http://www.freerepublic.com/focus/f-news/1026551/posts?page=525#525
See also:
Gay-Affirmative Public School Teachers/Curricula May Influence Brain Maturation In Teens