So, worded my second review request around the assumption this meant sexual... but it seems with the update they've added a blanket "Mature" option which, in their own words:
"Mature
The Mature content label is a catch-all and the default content label. It can be used on its own or in conjunction with one of the other categories. Any post with a content label will also have the Mature label (for example, it isn’t possible to add the Violence label and not the Mature label).
If you feel like none of the other categories apply but you think there should still be some kind of NSFW warning on the post, Mature is probably the right one to select."
Starting to seem like they've created a vague umbrella flagging option so they can cover their asses when flagging stuff like trans and/or Black people existing, transfeminisim, antizionisim, or anything they've been following the mass reporting, credit cards, advertisers, and the CEOs ego to remove/censor/suppress. Can't give them shit for flagging your clothed selfie within TOS as "mature" the same way as you can for flagging it "sexual content" because then they aren't branding it as breaking their TOS on sexual content, just as something that's nebulously for "mature audiences" and "not safe for work".
Of course, can and still should absolutely give them shit for this kind of stuff, it's just them doing the same bigoted moderation practices they've been doing since before their last lawsuit about it, but now with a thin veneer of plausible deniability.