The specific causes of sexual incompetence will be analyzed according to the specific patient’s condition. It is more common for male patients to have sexual incompetence in clinical practice. The male patient’s sexual dysfunction can be manifested in the following two aspects, firstly, penile erectile dysfunction and secondly, premature ejaculation. These two causes are more complicated, for example, some patients may be more stressed because of mental pressure and more nervous during sexual life, thus leading to sexual incompetence. There are also patients who may have misconceptions about sex and lack of sexual knowledge, which may lead to sexual incompetence. There may also be underlying diseases, such as diabetes, cardiovascular and cerebrovascular diseases can also cause the patient’s sexual inability.