What is the reason for insufficient hardness during erection after circumcision?

Patient's question:

My boyfriend had a circumcision two months ago. Now, when he gets erect, it's not hard enough, and it's difficult to penetrate. Could you please ask the expert what's going on? Besides psychological reasons, are there other factors? Will this affect his future sex life?

Doctor's answer:

Hello: According to what you mentioned, the current situation should be entirely psychological. Many men cannot determine whether they suffer from impotence, but they can judge the nature of impotence from the nocturnal penile erection. Normal men of all ages can experience reflexive penile erections during sleep. During adolescence, the average number of nightly erections is about 6, each lasting 20-30 minutes; young and middle-aged adults have an average of about 4 nightly erections; healthy elderly over 65 years old can still have a total of 1-1.5 hours of erections per night. Even children often have penile erections during sleep.
Clearly, nocturnal reflexive penile erections are unrelated to sexual stimulation and are not influenced by psychological factors, making them useful for distinguishing whether impotence is caused by psychological factors or by medical conditions. If an impotent patient has no nocturnal erections or if the degree of erection is below the normal range for their age group, there may be medical factors that need further investigation. If an impotent patient has normal nocturnal erections, it is unlikely to be caused by medical factors but rather by psychological ones. Here are several methods for self-assessing nocturnal penile erections:
(1) Stamp Test: Use four stamps to surround the penis, stick the overlapping parts together to form a ring, and then go to sleep. In the morning, check if the stamp has torn. If it has, it indicates nocturnal erections. If the overlapping part comes 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 sleep, wrap it around

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