If I might modify your answer above a little bit.
Where BSA and its Chartered units draw the line is in selecting leaders. A typical adult Scouter participating in a troop or committee is not asked for a test oath or quizzed about issues like homosexuality.
Likewise, ten year old boys when preparing to join aren't asked for "sexual orientation" because rightly children and sdolescents are thought not to form such things in that age group.
In fact, I imagine that a healthy thing would be to say that such is not a decision, but instead what we would call in politics a "push poll". Asking presupposes that individuals are supposed to "make a selection" at some point. Instead, the selection is made at large for a two sex species and disorder (or whatever term people want to use) allows patterning in other manners in a small minority.
Scouts uses a program of "Two Deep Leadership" so that adult scouters are always at least two in number in dealing with scouts. The thought being that if one adult has deviencies, the presence of the other precludes that first adult from exercising such actions. This works well for any sort of wrong choice that an adult might involve youth in if left by themselves.
The Scout's position statement on homosexuality and the BSA states, "As a private membership organization, we believe our right to determine the qualifications of our members and leaders is protected by the Constitution of the United States." The Boy Scouts have, in fact, denied all requests made by their member toops to sign any form of non-discrimination agreement. The scouts appear very firm in their commitment to hold their membership to the same standards that they hold their leaders to, as well they should. Having taken their stand on the question of homosexuality, it would send a very mixed message to allow homosexuals in one area but not another.