If every gallery was tagged (and categorized) perfectly, all of these searches should have 0 results. Numbers in brackets are the approximate number of results when first entered here. Note that many of these searches will overlap (i.e. fixing one gallery may decrease the result count for multiple searches). Note that in many cases given below, you could get more invalid results by applying a namespaces (e.g. "anal intercourse" -anal$ may not find galleries tagged m:"anal intercourse" but without m:anal$ if f:anal$ is tagged). In these cases, I only give the version without namespaces.

Misc Requirements

"anal intercourse" -anal$ (200)
"anal prolapse" -prolapse$ (10)
bikini$ -swimsuit$ (8500)
"cervix prolapse" -prolapse$ (30)
"clothed paizuri" -paizuri$ (100)
coprophagia -scat$ (50)
cumflation -inflation$ (850)
deepthroat -blowjob$ (2500)
dismantling -robot$ (5)
"gender morph" -"gender change" (2)
hanging$ -asphyxiation (8)
"internal urination" -urination$ (100)
milking$ -lactation$ (700)
f:onahole$ -futanari$ -shemale$ (200)
"oppai loli" -lolicon$ (325)
pegging$ -"strap-on" -"sex toys" (1000)
"phone sex" -masturbation$ (120)
"piss drinking" -urination$ (1500) - this requirement seems fishy because it's entirely possible to have piss drinking without urination, clear this before starting a clean-up.
sarashi$ -bandages$ (20)
"scat insertion" -scat$ (1)
f:smalldom -femdom$ (15)
"stirrup legwear" -pantyhose$ -stockings$ (175)
"tail plug" -anal$ (1000)
"tail plug" -"sex toys" (1250)
toddlercon$ -lolicon$ -shotacon$ (100)
"unusual insertions" -"sex toys" (204)

Incest-Related

Note that several searches such as m:father -yaoi may have valid result due to pussyboys.

Animals

Skipping for now because animals without bestiality / animal on furry / animal on animal can be correct (see Talk:Tag Relations).

Creatures

Groups

Multiple Activities

Sole xxx / xxx only

Tags like females only imply that there are no tags in the male or mixed namespace, barring some exceptions (notably gender change).

Futanari / Shemale

Skipping for now because tags like male on dickgirl without futanari and shemale can be correct (see Talk:Tag Relations).

Costume Crossdressing

m:bikini -m:crossdressing (35)
m:bride -m:crossdressing (15)
m:bloomers -m:crossdressing (40)
m:cheeleader -m:crossdressing (5)
m:"chinese dress" -m:crossdressing (10)
m:corset -m:crossdressing (8)
m:hijab -m:crossdressing (0)
"josou seme" -m:crossdressing -tomgirl (60)
m:kunoichi -m:crossdressing (2)
m:"magical girl" -m:crossdressing (25)
m:maid$ -m:crossdressing (50)
m:miko$ -m:crossdressing (10)
m:nun$ -m:crossdressing (10)
m:pantyhose -m:crossdressing (70)
m:"pixie cut" -m:crossdressing -tomgirl (2)
f:"schoolboy uniform" -f:crossdressing (140)
m:"schoolgirl uniform" -m:crossdressing (81)
f:waiter$ -f:crossdressing (7)
m:waitress -m:crossdressing (10)
m:witch -m:crossdressing (25)

Bigger / Smaller Requirements

meaning all tags that require the smaller version of themselves

"big muscles" -muscle$ (30)
"gigantic breasts" -"huge breasts" (50)
"huge breasts" -"big breasts" (420 (nice))
"huge penis" -"big penis" (800)
ssbbm$ -bbm$ (10)
ssbbw$ -bbw$ (20)

Bondage Requirements

Technical Relations

"3d imageset" -3d$ (0)
caption -rewrite (150)
"full censorship" "mosaic censorship" (70)
"full censorship" "uncensored" (10)
"mosaic censorship" "uncensored" (87)
3d "full color" (60)
"multi-work series" incomplete (350)
"no penetration" "nudity only" (100)
speechless "text cleaned" (150)
speechless english (600), other languages too
"rough grammar" -translated (0)
"rough translation" -translated (1)

Low Presence

High Presence

Wrong Category

Do NOT blindly downvote; galleries may be in need of reclassing instead.

3d outside misc (800 - BUT may be correct on mixed content)
"3d imageset" outside misc (10)
anthology in CG / image sets (3)
comic outside western (350)
figure outside misc (90 - BUT may be correct on mixed content)
"full color" in CG / image sets (100)
"game manual" outside misc (200)
goudoushi outside doujinshi / non-h (4)
hardcode outside cosplay / asian porn (0)
no penetration in non-h (20)
"non-h imageset" outside non-h (1000)
"non-nude" outside cosplay / asian porn (15)
p:original outside doujinshi (15 - mostly dealt with by autotagger so not worth bothering about)
paperchild outside misc (1)
"real doll" outside misc (6)
soushuuhen outside doujinshi / non-h (20)
speechless in imageset / gamecg / cosplay (150)
tankoubon outside manga / non-h (60)
themeless in doujin / manga / CGs (4)
"western cg" outside western (225)
"western imageset" outside western (650)
"western non-h" outside misc (350)
m:yaoi$ in non-h (50)
f:yuri$ in non-h (90)

Reclass Tags

Active reclass tags are a good indicator of galleries that need reclassing. If the galleries are in the correct category, the reclass tag should NOT be downvoted (the autotagger will take care of that in a while).

doujinshi (50)
manga (20)
artistcg (160)
gamecg (25)
western (250)
non-h (200)
imageset (140)
cosplay (0)
asianporn (10)
misc (90)

Weak Tags

Ideally, there shouldn't be any weak (dotted border) tag, such a tag should either be voted up if correct or be removed if incorrect. As such, any search using a (positive) weak: qualifier should have zero results (I won't provide an exhaustive list).

User:Peterson123/Impossible Tag Searches

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