I don't think I can allow hentai terms like that to be used. It's the kind of thing googlebot picks up on to flag websites as 18+.

As for the card pictures. just having them link to another page isn't acceptable. It's actually also against the ToS to do that. My potential idea what to wrap the 18+ content in a BB code that can only be seen by those with member status, gained at 20 posts. I don't really like having to do that, but if you want them there, that would be the only option. Otherwise, if these networks come here and see those, game over.

Can 2. and 3. not be combined into one card detail page? Just have it list other appearances or something.