Okay, the girlfriend wanted me to share our numbers with the group. I'll let her remain annonymous... she can out herself later if she wants.
I've given her all of my fingers up to the last knuckles... haven't quite been able to get the whole hand in yet. Occassionally we work on it
I just recently did three fingers in her ass all the way, and that seemed to go well. I think that will be the maximum though... can't see a need for more... unless she asks for it of course. She always gets what she wants.
Like it's been said already though, two fingers is all you really need to be effective. The additional fingers just make for a more intense/kinky experience... which can be a very good thing.