Ohh my... Had no idea AV deal with that stuff too.
Well, back in the past, Ethan authorized a ban on hentai images and begin purging the wiki pages. New Rules: No Hentai Images.
After the split of the Whiskey Media sites and the disappearance of the former staff without any word except for Godlen, there was a spike in hentai wiki pages creation when FoxxFireArt, ShadowKnight508, Sonata, and new editors such as AgentFakku, Dragonknight2, and SpeedForceSpider. It motivated those editors to create those wiki pages when the niche was formed.
Though, we still follow Ethan's rules, no adding images that have nudity or sexual content since there are teenagers and children roaming about these forums.
Over at Comic Vine, they handle hentai manga as well except they allowed all nudity for their covers.