so that means everybody has to go back and recheck the nudity flag on all their nude pix?

No, all tags have been carried from over from the old galleries. (Although obviously if you hadn't set the flag correctly on your original upload, it'll still be wrong!)

However, if you had your options set to not show nudity, then you may need to double-check that you're still filtering nudity out. (It seems that it did carry over for some people, but not others.)

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire