Once a man wears a condom, the penis is soft, there are two main reasons: psychological factors and pathological factors. 1. Psychological factors: mainly patients in a certain time when wearing a condom to have sex, because of some reason caused by accidental weakness, produced a psychological shadow, the formation of operational stress disorder. In the future every time you wear a condom, the patient may be unconsciously worried about going weak, produce psychological barriers and anxiety, due to the psychological impact of the inhibition of erection resulting in penile weakness. This situation should strengthen psychological guidance, self-confidence and communication, serious need for professional psychotherapy. 2. Pathological factors: previous history of erectile dysfunction and silicone allergy. Patients with a history of erectile dysfunction will experience localized constriction after using a condom, and lack sufficient stimulation caused by direct contact with the vagina to experience penile weakness. Men who go soft when wearing a condom are advised to seek prompt medical attention to avoid delays.