Impotence does not occur suddenly, and an occasional weak erection cannot be defined as impotence in general, because impotence refers to the inability of the penis to maintain an erection sufficient for normal sexual intercourse in the past 3 months. Impotence is related to many factors, not only to diseases such as age, cardiovascular disease and diabetes, but also to the living environment, the relationship between oneself and one’s sexual partner, and the influence of psychological factors. In addition, bad habits, such as staying up late, being more tired, not getting enough sleep at night, frequent masturbation, exposure to obscene books and movies, and too frequent sex can all lead to impotence and inactivity.