These "new" rules may be the old rules but there was some commenting on recent rules updates of displaying nudity on X/Twitter. It seems to be still allowed but can't be on profile pics, etc which are automatically seen. However it appears you can continue to post adult nudity if you flag it as sensitive content -- which requires a user affirmation to view it.
I no longer post any nudity on twitter. There was just way too much hard core stuff being posted, so I understand the crack down. Twitter is a really great platform and has been very useful for sex work advertising and networking, everyone just needs to tone it down a bit so the whole lot of us do not get kicked off. It is what it is. They allow us to post sex work ads and such without much censorship, unlike facebook, so I am OK with it. We just need to color within the lines and all will be good.
When you have the urge to post your naked self on twitter, just send those picture to me instead. The extra benefit to you is that I don't penalize for any coloring outside the lines, and in fact, I give extra credit for it. 
It's been like this for a long time now. If you even post a photo that is borderline you will get a notification saying:
We put a warning on one or more recent posts because they might have sensitive content. If you think this warning is a mistake, you can appeal.
I still see plenty of nudity (partial and full) as well a sex videos on "X". None of it is flagged.
didn't crash, go ahead and post some more. Lol
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