Ok, so I was looking for tagging mistakes by searching -rating:e penis. What I found was a bunch of questionable posts:

so yeah, don't really know how this should be tagged and I'd apreciate help.

any even small sliver counts 1-2
bulge is bulge not penis 3
a snake penis is a snake not a penis 4

If the penis is just barely visible (such as the base) then it should still be marked as explicit. They should also be tagged with subtle_penis and/or penis_base.

notawerewolf said:
a snake penis is a snake not a penis 4

Unless it's a snake_penis. I see that someone untagged penis from post #1380018, but left snake_penis. That's no good.

Either it's a snake_penis and explicit, or it's just a tail. I can't really tell, it seems to be connected to the side of his hip...?

First two are definitely wieners. I've seen enough to know.

Third one should have been tagged with big_bulge or just bulge, not big_penis. Went ahead and fixed that.

Fourth one - ehhhhhhhhhh

It's explicit now.