"I cannot recommend this book. That is not because it is not well-written ... nor because it doesn't dive deep into trying to understand the who and what of humankind. That fundamental question is the very thing we want from a good science fiction story. I do not recommend it simply because I have moral objections to the story's graphic and over sexualized content. This book made me feel....dirty, as if my soul needed a good scrub. I therefore cannot recommend it to you."Now that's a review!
No, Silverberg's psychedelic odyssey of a tantric messiah certainly isn't for everyone. But it is a masterpiece, and one of my personal favorite SF works of all time.