fingers seems like a strange tag, considering that it's a generic body part. Any opinions on this? Should it be aliased to invalid_tag? It is tagged quite a lot, though. If it has a proper use, I think a wiki page should be created.

@Kemono-Kay: It seems to be explained in finger where it is aliased. There might be some cases where the finger is part of a focus, even if not flipping someone off or fingering someone.