I've noticed a lot of inconsistencies when it comes to the ratings of omorashi posts.
This forum post will be 90% examples, so if you don't like looking at omorashi/urine, I'd suggest not clicking on the post links here.
Anyway, let's get into it!

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post #1545108
I posted this as explicit, but someone later changed it to questionable.

post #1543320
I posted this as questionable, but someone later changed it to explicit, despite them wearing clothes unlike the character in the former image.

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post #1493597
This character, with a noticeable bulge is wetting himself. Questionable.

post #1493597
This one, of a character doing pretty much the same thing, is rated explicit, despite the character's crotch area being completely covered by their hands.

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post #1478682
Explicit

post #1478678
Questionable

So urine is less explicit when it's depicted in a bladder meter?

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post #1410817
Isabelle is wetting herself, questionable.

post #1410818
Isabelle is wetting herself more, explicit.

The fact that there's more urine on-screen makes it explicit?

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post #1445643
Naked lucario urinating, questionable.

post #1459888
Fully clothed canine wetting himself, explicit.

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post #1459912
Fully clothed... thing wetting himself in a bathroom, explicit.

post #1476127
Isabelle wetting herself from a worm's-eye-view showing her underwear, also explicit.

post #1435369
Dog in only his underwear wetting himself, genital bulge visible, questionable.

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And there are plenty more things like this that I haven't touched.
I think it goes without saying that we need some sort of clear line between explicit/questionable here, because this is just complete anarchy.