The phenomenon of weakness in the middle of sexual life in men may be due to the recent excessive psychological stress or poor mental state of the human body, such as the habit of staying up late or drinking alcohol, resulting in a decrease in energy. Therefore, there is an abnormal phenomenon in sexual function, through reasonable dietary regimen as well as proper rest, observe whether it can be improved. If this phenomenon occurs frequently, it is recommended that men have an erectile function test and a Doppler ultrasound of the penile corpus cavernosum to clarify whether there are abnormalities in the vascular and neural conduction of the penis. Common diseases, such as diabetes, hyperlipidemia, and cardiac problems, such as cardiovascular disease, can lead to weakness during sex. Some patients may also experience weakness during sexual intercourse due to previous trauma, which can cause arteriovenous fistulae in the cavernous body of the penis. The effective examination can differentiate and treat the specific cause.