Is adult content allowed?
Waterfall welcomes adult content, and has protections in place to make sure only those who want to see it are able to.
What counts as NSFW?
For the purposes of Waterfall, NSFW uses the traditional definition - Not Safe For Work. The basic litmus test for this is as follows - would the average employee at the average company be in trouble if it was on their screen at work? If yes, tag it NSFW!
This includes nudity (including topless people, regardless of gender), violence, or bloody content, which are pretty safe bets for getting someone in trouble.
Sexual content can be a trickier subject - some content can be educational, and that stuff should be seen. However, it's important to remember this is a public site, so posters should be mindful of using appropriate tags. If the content is intended to be educational, forego the NSFW tag and use the "Sexual Content" tag instead - this way people who don't want to see it can still block it, while still being visible otherwise. If it's explicit sexual content, be it artistic or otherwise (including talking about your sex life in detail), it should be tagged NSFW.
To assuage any concerns related to the actions of platforms in the past, LGBT+ content is subject to the exact same tagging rules as all other content, and is not considered inherently NSFW or explicit if none of the above apply.
The NSFW tag is mandatory for posts it should apply to, and is one of the special case tags.
If your blog posts primarily NSFW content, it should be marked as adult only. This will prevent minors from being able to access it.