It occurred to me while searching that there is a lack of a few sorts of tags for female/female images.
First, there seems to be no name for this position:
And this, very similar position:
The distinction being whether the legs are interlaced or on the same side.
Though often involving tribadism, this class of positions may involve other acts, such as double-ended toys:
And, of course, tribadism is used in other positions as well.
Anyway, I think, even though there's a slight difference between the two positions, for the sake of simplicity, they should both be given the same name. The position is sometimes called scissoring, but that's also used to mean tribadism, and so might be a bit ambiguous (and indeed is already aliased). As such, I propose either scissor_position or x_position (being that the legs appear to make an X shape in this position, whether or not they're interlaced).
Furthermore, we have this position:
Which is sometimes tagged as missionary position, but is more often not (and to me seems distinct). I don't know if a name for this position exists, but I couldn't find one, and it's a very common position.
Finally, there doesn't really seem to be a tag for the vaginal equivalent of a handjob. I found fingering_partner, which seems reasonable (though slightly ambiguous since it doesn't specify what's being fingered), but is quite undertagged. Should that be the tag used for that act, or is there a better option?
There were some other observations, but I'll stop here to avoid making this too massive to take in.
Updated by Chessax