I notice many subjects in the Tags portion of this site are subjective, i.e. “interesting background”, “Inappropriate”, “silly pose”. It seems users create these for their own personal collection. There is one instance where a user has replaced several back images just to add the tag “Gum stain” to each.
Perhaps when clicking on the “add tag” feature, users can be taken to a page that suggests they create a user list for such details.
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https://www.youtube.com/channel/UCPoAYGOXYlY9OBIZPKqsCgA/videos