My name is he Lei. I am 26 years old. I am a professional engineering designer. I have a 25-year-old wife, Liu Yun, who is a department director in a foreign enterprise. They have been married for five years. They have been loving each other and their life is simple and happy. It was just after the initial passion that I fell into a sexual trough. In my wife may not see, but I know that every time I do with my wife, I feel like I’m paying public food. I have lost my original passion and excitement.