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Hopefully someone can help me with this:
A long time ago, a friend described a book to me. I only remember this short excerpt, but am hoping someone will be able to identify what my google-fu has been unable to :) :
The plot involved a female robot, and it was important that the robot had no emotions. At one point in the book, the robot has sex with a man, and the scene describes how she brutally mutilates him (tearing off his genitals, possibly ripping out his spine) because she has no sense of pain/emotion and can't comprehend how he feels. Much of the narration (possibly first person?) is stylistically cold and emphasizes the robot character's complete lack of emotion/empathy. It's also possible that it was part of a short story, and not a full novel.