More than you probably ever wanted to know (and more than I wanted to know).
Short version: gays who advocated removing age limits on consensual sex (but note gay groups who will have nothing to do with them). As expected, they went nowhere with this.
I see they reportedly had a high membership of 1,100 at one time, but now, for all intents and purposes, have ceased to exist. Yet they live on: in the fears and the smears of right-wing media.