The rules page linked in the sidebar here is only for the !anime@ani.social community. For rules specifically about NSFW content, here is a direct link to the section where I try to explain the rules.

Short version:

• No posting of hentai in this community.
• If you are posting a clip of a non-hentai show that still has nudity (or very heavy fan-servicey bits), you can post it, but mark it as NSFW.
• If you are linking to an article that talks about sexually explicit things or has art that is explicit, mark it as NSFW. (some sites also have a bunch of NSFW ads or other content that is NSFW, so mark those sites as NSFW as well when you post)
• Cases where there is an article about hentai, but the article itself doesn’t feature explicit art/images should be marked as NSFW, but may be allowed on a case by case basis.

Let me know if you have any questions still!