Hmmm... I'm not sure if anyone has already suggested before but how about including "guro" as a genre? That's 'cos I'm sure there're lots of people who'd love to filter it out and who wouldn't want to stumble upon such content by accident.

It was already suggested and shot down because guro is not a genre in itself but a sub genre of hentai...so no...

Ahhh... I see. Oh well.

Say... who's that from your avatar?

Mayu and Mana from a Japanese Eroge which I sadly have not played due to two reasons: No English translation available and my hesitation towards Guro

Oh... they look really cute. ^__^ And yes guro is frightening.