Sex is soft at once, refers to the erection time is too short to complete sexual intercourse, belongs to the erectile dysfunction of a clinical manifestation. The main consideration is related to psychological factors, mental factors, organic factors, drug factors and other factors. 1. Psychological factors: the lack of sexual skills, the relationship between sexual partners, work or study pressure is relatively large, are common causes of erectile dysfunction. 2. Mental factors: excessive tension, anxiety, depression, anxiety and other psychiatric disorders can also trigger erectile dysfunction. 3. Organic factors: diabetes, arteriosclerosis, hypertension, small penis, prostatitis and other diseases can lead to erectile dysfunction in some patients, and then the phenomenon of short erection time. 4. Drug factors: after the application of loratadine, diphenhydramine, propylpyridine phosphate, progesterone capsules and other drugs, some patients may have erectile dysfunction and other adverse reactions. 5. Other factors: such as smoking, alcoholism, late at night, overwork, etc., may also induce this disease. The above drugs should be used under the guidance of a doctor. The cause of this symptom is complex and may be caused by other factors. Patients are advised to seek medical examination as soon as possible and follow the doctor’s instructions for treatment.