It isn't tags or categories, and it doesn't appear to be titles. My guess is it's related to the Search Blogs function, searching the content of the post. So for images that would presumably include the Captions, Alt Text, or whatever you want to call it.
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"Possibly Related Posts" Suddenly Showing up for One Post Only w/NSFW Content
If you see a mature blog or similar, report the blog immediately:
You can also find that link from "blog info" in the top right of your admin bar.
For general feedback about the quality of the links just contact support and they'll pass it on to the proper folks.
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