I would guess that most publishers shy away from the eroticism of rape and child abuse, since they could be seen as promoting such behaviors in their readers. Yeah, I know, mystery readers don't go out and commit murder--but people do indeed imitate scenes in erotica. Some day I'll share the story of the turnip.
Anyway, rather than seeking a list someplace, go shopping, ideally in the flesh rather than online. Browse extensively at a store that carries what you write. Jot down the names of publishers, authors, and titles, then come home and do your research.
That said, I'll go on record as saying that I find no possible erotic content in a rape or in the abuse of a child, and I worry about those who do.
Maryn, who could have been sued but was not