I am an Eagle scout; there are quite a few of us on this site. I loved the Boy Scout program, worked a boy scout camp for years during high school and college - it really is a great organization for building character in young men. their core values of citizenship, camping skills and sportsmanship are good.
However, somewhere in the late 1980's they began to reinterpret part of the scout oath ("morally straight") to mean that gays were no longer welcome. Homosexuality was never mentioned when I was in scouts; no inappropriate actions by other youth or leaders; no basis for the bigotry.This shift has been really unfortunate for their membership - it has shrunk significantly since the supreme court case, James Dale VS Boy Scouts of America. James Dale was an adult leader and a gay activist on his college campus. someone in the scouts found out about his activism and his local troop kicked him out. he sued and it went all the way up to the supreme court. They decided that the Boy Scouts are a private organization, not a public accommodation, and therefore they could create discriminatory membership practices.
The Boy Scouts of America is the only scout organization in the World Scouting Movement that discriminates in this way. Recently the UK Scouts has been specifically recruiting gay youth and leaders. You can also get more info at ScoutingForAll.org.