You can be a youth member and be gay as long as you're willing to live as a second class citizen, i.e. not avow that you're homosexual or hold a youth leadership position. They don't specifically bar homosexuals:
Because, you know, nothing is better for our youth than making them deny who they are and teaching them they aren't worthy of being in a leadership position because of their sexual orientation or religious beliefs.
http://en.wikipedia.org/wiki/Boy_Scouts_of_America_membershi...
Because, you know, nothing is better for our youth than making them deny who they are and teaching them they aren't worthy of being in a leadership position because of their sexual orientation or religious beliefs.