Amazon calculates a product’s star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers, and factors that establish reviewer trustworthiness.
This book amazed me at the level of full on pornography. The story suffers in this book because of the overall interest in showing straight out sex acts of every type conceivable. I don't mind the sex if it adds to the story but the story is crazy weak like a poor porno that tries to be serious.