What's the site's policies regarding NSFW content? I can't find it in the rules.
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Which "site" (full URL link)? Which "rules" (full URL link)? For mediawiki.org, see the footer: there is a Privacy Policy, Terms of Service, and there is Project:About.
I was referring to MediaWiki's policy on NSFW content.
If you mean this wiki specifically: All Wikimedia projects, including MediaWiki.org, are not censored (See foundation:Resolution:Controversial_content).
But if you set up you own MediaWiki instance, you can establish relevant policies on your own.