Now that you mentioned it, I don't remember there being any allusions to rape whatsoever. One Lich casually says he plans on committing a few genocides here and there if you help him escape imprisonment (and if you do, end-game slides show he wasn't kidding), one of Aru's acquaintances mentions how she used to love flaying people alive and making dresses out of their skins or something to that effect, but nope, no rape-y stuff at all, even as a hint.
That's one helluva hierarchy of taboo and sin.