Not sure if I quite understand your post Karl, but it does pose some interesting questions:
How many of the current and preceding GA had sex (with women or men) before serving a mission?
In other words, which ones (and how many) would not even have their current callings had they been subjected to this policy that puts conditional restrictions upon repentance and forgiveness?
I doubt that any of them did. Not that they wouldn't have, given the opportunity, but it's so very difficult to imagine most of them as 18 year olds with raging hormones, girlfriends, and wet dreams. Maybe a few of the younger ones, but the rest? Even back then, some of them would have been self-righteous .... ummm... cattle prods.
Of course we have no way to know the past life issues of current GAs. It seems rather silly to bring it up. My guess though is there are certianly some leaders that had problems with this particular sin and have repented. It is not a requirement to serve a mission to be a GA. Some who are there were never missionaries.
We do believe in repentance and forgiveness so prior sins of youth does not mean never a GA.
However, I do understand the stigma issue and agree with Inc that that while the message is one can repent and be forgiven there is a restriction. This is why I do not like RTB. I see the prudence of not sending a youth out who has sexually sinned frequently and then wants to do a repent and go. But if such a one has repented and shown by a significant period of time ( a year at least) that they have changed their ways and really want to serve then they should serve.
But I do despise stigmas.