"I didn't know that the healthier I get, the more I want to have sex." Satsuki Hitomi, 53 years old. Her children have successfully become independent, and she is now a full-time housewife enjoying a leisurely life with her husband. Though she has a gentle and calm demeanor, she has loved physical activity since she was young and still attends yoga classes whenever she has free time, never neglecting self-improvement. However, her healthy...