www.rapedungeon.com

There's a section marked dungeon there, where women who want to explore rape fantasies can put up a picture, a bio, and make a request (topics they'd like to cover even the fantasies). Some of the sub ideas are so clever, it makes for an interesting read...

Sadly, this seems to be exclusively heterosexual with occasional lesbianism (LCD male attraction stuff). But if you want something more, you could always contact the webmaster and make a compelling case...