Before purchasing this book, I read some of the mixed reviews on amazon.com, so I didn't have particularly high expectations going in. At the same time, I remained hopeful that there would be something of interest in this book. However, as I suspected, and as the reviewers already stated, this book was a little disappointing.
Basically what the author does is spend the whole book trying to build a case as to why it could be possible that people will eventually have sex and develop relationships with robots. Chapter by chapter, he tries to assemble the different pieces of the argument: humans have relationships with pets... humans have relationships with AI robots and computer simulations such as Tamagotchi, Furby, AIBO, and KISMET... humans use machines (e.g., vibrators) and sex dolls for sexual pleasure... attitudes toward various sexual practices (e.g., masturbation, fornication, homosexuality) have evolved over the years. Put it all together now: in the future, there's a good chance people could develop relationships and have sex with robots, and we'll be cool with that.
As other reviewers already stated, he does not raise any ethical questions about whether this is a good idea or whether this is where the human race should really be headed. It seems that these types of questions were beyond the scope of this book. But even for what the book is, I kept waiting for it to get better, but it never really did.
If you're looking for better books about the interaction between humans and computers/robots, you're better off reading "Alone Together" by Sherry Turkle or "The Shallows" by Nicholas Carr.