I came across this post which seems to have incorrect implications. The crux of it is that it depicts a (pierced) cloaca with a clitoris, which the admins recognized by locking +cloaca -pussy (among other tags). However, currently clitoris_piercing implies pussy_piercing and clitoris, which implies pussy. Meanwhile, pussy is locked off of the post, so it has the pussy_piercing and clitoris tags but no pussy tag.
So it seems either that post's tag locks should be reversed (lock off cloaca-related tags and lock on pussy-related tags), or it shows the following implications don't hold and should probably be de-implicated:
clitoris_piercing (clitoral_hood_piercing?) -> pussy_piercing
clitoris (clitoral_hood?) -> pussy