"Tag what you see, not what you know" is the mantra for dealing with how to tag things and in instances where things are unclear. I feel that this rule is well intended and the reasoning behind it makes sense, but it also causes various sorts of drama. I recently ran into this myself and got pretty mad over it, but instead of going and vandalizing the shit out of the site I sat down and thought: Why does this make me mad?
I (or my character is, if you prefer) am a herm so I got butt hurt over being labeled female or dick girl in various pictures of mine. I was mad because I'm not these things and felt insulted by it. After reading some similar complaint threads and understanding the reasoning of the admins I agree that TWYSNWYK is the right way to go about things, but I think it should be taken a step further even. All gender tags should be stripped out of the database entirely and/or altered into something else.
What I propose is that all instances of female or dickgirl should be instead "Feminine Figure". Male should be "Masculine Figure". Herms, Cuntboys, and things like that would have to be evaluated on a case by case basis to determine which they are. Aliases can be created to keep the ease of search up where Female actually searches for Feminine Figure, etc. Then on a properly tagged picture you can just search for whatever sexual attributes you're actually looking for and you've eradicated the problem of people complaining about not being tagged as the right gender.
The existence of the "Male" and "Female" tags, as uncontroversial as they probably ought to be, causes a lot of contention in some places. It seems to be particularly difficult to tag Feral or MLP art as male or female when not able to directly view tits, dicks, or vaginas. For example:
http://e621.net/post/show/227347 Been labeled Herm, Dickgirl, Male, and Female at various points in the tag history. Where is the female? I see no vaginas or breasts in the image at all. Tagged incest for no apparent reason. Short of the characters saying "It sure is fun to fuck my mom" how is one supposed to determine if an image should be incest with out outside knowledge of the subject?
http://e621.net/post/show/223278 Tagged "Male" with no evidence of a male in the picture. Even tagging it "Sex" is questionable.
http://e621.net/post/show/230050 Tagged "Male" but it could be a Shemale. Same for "Crossdressing" and "Girly". How do we know these things? All we really know is that the character has a penis and appears feminine.
http://e621.net/post/show/217094 Tagged as Male with no evidence as to what gender at all this character is.
http://e621.net/post/show/215690 Tagged as male, tag was deleted, retagged as female. No evidence of gender at all.
http://e621.net/post/show/231607 Tagged as "Female" with no supporting evidence. "Cunnilingus" is not inferrable. It could be rimming.
http://e621.net/post/show/229133 How do we know that penetration is going on here?
I like e621, but I'm hesitant to even bother with trying to to fix some of these images because in the past when I've done so, someone else comes along and just reverts it. I'd probably get labeled as a tag vandal if I went and just started stripping incest, male, female, or other similar tags out of images even if there's no direct visual evidence of them.
Updated by Millcore