What causes poor penile erection?

Patient's question:

Hello? When I have sex with my girlfriend, I often feel that my erection is not good. An ultrasound check showed that the blood flow velocity of the penile aorta is 10.8. What should I do? Is this erectile dysfunction? Is it serious? Can it be treated? Are there any good methods?

Doctor's answer:

Hello, many men cannot determine whether they suffer from erectile dysfunction, but in fact, they can judge the nature of erectile dysfunction based on the nocturnal penile erection. Normal men of all ages can experience reflexive penile erections during sleep. During puberty, there are about 6 erections per night on average, each lasting 20-30 minutes; young and middle-aged adults have about 4 erections per night on average; healthy elderly people over 65 still have a total of 1-1.5 hours of erection time per night. Even children often have penile erections during sleep.
Clearly, nocturnal reflexive penile erections are unrelated to sexual stimulation and are not affected by psychological factors. Therefore, they can be used to distinguish whether erectile dysfunction is caused by psychological factors or by medical conditions. If an erectile dysfunction patient has no nocturnal erections or if the degree of erection is below the normal range for their age group, it may indicate a medical condition and requires further investigation to identify the root cause. If an erectile dysfunction patient has normal nocturnal erections, it is unlikely to be caused by a medical condition but rather by psychological factors.
There are several methods for self-assessing nocturnal penile erections:
(1) Stamp Test: Place four connected stamps around the penis, stick the overlapping parts together to form a ring, and then go to sleep. In the morning, check if the stamp connections are torn. If they are torn, it indicates nocturnal erections. If the overlapping parts come apart due to poor adhesion, it is not meaningful.
(2) Penile Circumference Measurement: There is a commercially available tape measure (usually paper-based) with one end connected to a square buckle. Before going to bed, wrap it around the penis, and let one end protrude from the buckle. First, record the baseline circumference of the penis in its flaccid state, then...

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