Not really quite as bad as the others here, but I read the first two books of the Sword of Truth series by Terry Goodkind as a young teen before getting squicked out by it. The female lead almost gets sexually assaulted four times (one of them being when she rides into the middle of a battlefield completely naked for incredibly contrived reasons). The entire first half of the second book is the author's BDSM fantasy forced into plot relevancy. But perhaps the worst I read was some evil ritual that involved the villain cutting off and eating the genitals of a young boy.