Yeah I didn't really know what Sensitive entailed. It generally looks like extreme horror or nudity?
I guess everything can be sensitive to somebody.
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It's not an age category. Which makes it confusing.
If you think your game should not be played by 13 year old kids or should not be seen at a workplace, you should mark it as sensitive.
And Itch might have a different opinion. Especially the workplace thing is very vague and usually a little pixel nudity would be enough for that.