If you have nudity or sex in your art, it usually qualifies for being necessary to be marked as adult. The setting is what you want. Unfortunaly you cannot deactivate that setting, since you have published a marked as adult game yourself.
You can always browse in a new incognito window. That will have that setting off.
There are only two maturity settings on itch. On or off. And nudity is generally put in the category "on" . Even if it would be artistical or could be shown in day time tv. Ok, maybe not in the US.
I understand what you mean, but itch is US based, and they do not differentiate between different shades of nsfw. At least not in this case.
