Eight months ago the first male department of Guangdong Province, the third hospital affiliated to Zhongshan Medical University, last week opened the province’s first “male sexual function testing room”. Since then, patients with impotence will get a scientific “qualitative” and “quantitative” diagnosis here. In the past, “stamp test” countless evidence, the head of the laboratory is a study in Japan for 8 years specializing in male science specialist Dr. Zhang Bin. He said that in the past, doctors relied mainly on patients’ self-reports to diagnose impotence. The determination of the cause of impotence – whether it is psychological or organic impotence – relies on a number of objective tests. Healthy adult men will have 3-6 natural erections at night while sleeping, which is a protective blood filling process that prevents the penis from necrosis due to long-term lack of arterial blood supply. Statistics show that the blood flow to the penis during each erection in normal men is 201% of the usual level, and anything below this value indicates underfilling and can be diagnosed as organic impotence [Note 1]. The oldest method to detect whether a male penis has a naturally engorged erection at night is the “postage stamp test”. If the roll of stamps is split and torn off when waking up from sleep, the penis has been erected. The disadvantage of this method is that it is only a “qualitative” test and does not record the number of erections and the specific blood flow. Today, “wave tracking” is well documented. Knoll, an American professor of masculinity, invented the “Bioelectric System”, which continuously measures the number, duration, length, thickness and blood volume of erections at night, and prints out these parameters and waveforms so that the doctor can determine the vascular cause of the patient’s erectile dysfunction as if he were reading an electrocardiogram paper. The patient does not feel pain and only has to put a few electrodes on the penis before going to sleep. During the Spring Festival, a 30-year-old foreign civilian worker often felt pain in his lower body after a car accident. Afterwards, the civilian worker claimed compensation from the perpetrator for sexual dysfunction. Did he have impotence or not? Was it psychogenic or organic? Who said it? The traffic department commissioned the Zhongshan Medical College to make a diagnosis. The “bioelectricity measurement system” found that the number of erections at night was normal, but the amount of blood filling did not reach 201% of the normal value. The hospital issued a diagnosis: “organic impotence, mild underfilling of the penis”. So that the mineworkers can claim compensation accordingly [Note 2]. According to reports, since the hospital opened the province’s first “male sexual function testing room”, a steady stream of patients come to check and consult every day. The oldest male patient is 76 years old and the youngest is 16 years old. Dr. Zhang Bin believes that sexual function testing can be used not only for the diagnosis of impotence patients, but also for premarital checkups. [Note 1] Zhang Bin, et al. Clinical application of nocturnal penile erection bioelectrical impedance volume measurement. Journal of Zhongshan Medical University, 2002, 23(1): 70-72. [Note 2] Nocturnal penile erection test is a common method to distinguish psychological or organic erectile dysfunction, but it must be combined with a comprehensive analysis of the patient’s specific situation, and other tests such as penile cavernous body injection, color Doppler ultrasound, and other neurological examinations must be added if necessary.