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(+17)

Content descriptors are a lot more useful than trying to decide what's appropriate for age X in hundreds or thousands of cultures across the world. I'd add gore (though that could fall under graphic violence) and nudity (because that's orthogonal to sexual content). Hope this helps!

Admin(+1)

Thanks for the feedback, I didn't consider an approach that doesn't use age ranges. One of the side effects of this project is that we'll be introducing an age gate for adult content, so there needs to be some cutoff point for "adult."