Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Lack of variety

I would not recommend this to anybody. About 30 percent of the postions are repeat at least once, there are some that are repeated three or four times, just under a different name. This book also doesn't have any information about the positions. I would recommend "Daily Sex: 365 Positions and Activities for a Year of Great Sex!" by Jane Seddon.