Instruct: Classify a given review into positive or negative sentiment.
Query: A Man and Wife's Perspective

I originally purchased this book having my wife and her ever-changing moods in mind. After skimming through the index, I realized that hormone imbalance is not simply a problem for females, but also applied to my life as a middle-aged man. My wife and I both loved this well written book and found a simple and natural way to stay young (and bring back our sex life).Thanks doc.