So.. right now... the following tags are aliased:
1girl3guys -- invalid_tag
2girls -- female
2guys -- male
3girls --female
3guys -- male
4girls -- female
4guys -- male
5guys -- male
I think these ALIASES are honestly a pretty horrible idea. The 'reason' for these aliases is "we can see how many people of what gender are in a pic, thank you"... but by that argument, *all* tags are invalid. Often, you CAN'T tell what genders are in a picture based off of the thumbnail (and if you're looking at the full image, then you can also see that there's a fox, and a bird and that they're in the missionary position [missionary position -> sex "we can see what sexual position they're in, thank you"])... which is why we have tags. Also, for searching.
I can think of plenty of cases where one might want to search for, say, "3guys threesome" for an all-male mini-orgy or "2girls 1guy" or likewise.
Admittedly, there is some complication when you take into consideration the herm and intersex part of the fandom... but, at risk of over generalizing, we could just refer to herms, cuntboys, dick girls, futa, and so forth as 'other'. as in "2girl 3 guy 1other". You can add in 'cuntboy' or '-herm' as needed to refine your results.
I think it'd help, over all with the usability of e621 in general :)
it'd take a lot of retagging, but... everything has to start somewhere..
Updated by AbsebaroKoon