Post Date December, 02 2023
After the male penis is stimulated, it will relax in a short time, quickly congest, and inject blood into the venous vessels in the sponge until the pressure rises to a certain limit. A blood filled penile sponge can support the penis, making it harder and longer.
Psychogenic erection
When a man excites the cerebral cortex due to hearing, vision, smell, thinking, imagination and other stimuli related to sexual content, and it is transmitted through the thoracolumbar erectile center of the spinal cord. After acting on the penis cavernous body, it will cause arterial blood vessels to expand, and a large amount of blood will flow into the penis cavernous body; When the veins constrict and the amount of blood flowing out of the cavernous body decreases, the blood will be fully trapped in the abundant blood vessels and blood sinuses in the cavernous body, making the penis quickly produce psychological erection. On the contrary, when the artery constricts, the blood flowing into the cavernous body of the penis decreases; When the veins dilate and the rich blood flow trapped in the sponge rapidly returns, the penis will become weak again.
Reflexive erection
When the external genitalia is subjected to local stimuli such as direct touch, walking friction, or internal stimuli such as the rectum and bladder, it can cause reflex erections. This is achieved by stimulating the lower erectile center of the sacral cord in the spinal cord to stimulate its sexual excitement. Penile erection is innate, and male fetuses can achieve an erection in the uterus. A little boy may also have a hard erection when urinating after birth. Sometimes lying there and urinating can make urine spray straight into the adult's face like a spring, often bringing unexpected laughter and joy to parents who are changing diapers. However, an erection at this time does not have any meaning of "sex". Any stimulation received on the genitalia itself can cause reflex erections, which are regulated by the pubic nerves and the sacral spinal cord erection center.
Nighttime erection
Men's sleep is always in the alternating period of fast eye movement sleep and slow eye movement sleep, and also undergoes the physiological process of erection - flaccidity - re erection - flaccidity. This is medically known as penile nocturnal erection, which is a normal physiological process for healthy men. Generally speaking, men have 4-6 erections every night, each lasting 20-40 minutes, for a total of two and a half hours. This is because the brain always suppresses the occurrence of sexual reactions during the day, otherwise men may encounter awkward situations from time to time. However, after deep sleep, this inhibitory function of the brain disappears, and the penis spontaneously experiences an erection reaction. This is completely normal and there is no need to worry. The duration, frequency, and hardness of nighttime erections decrease with age, with the strongest being between adolescence and around 20 years old.
After the release of external stimuli, whether psychological or reflexive, the penis quickly returns to its normal state. Erections at night are no exception. After an erection for a period of time, the penis will definitely weaken automatically, because if the blood is left in the sponge for a long time, it will lack oxygen and accumulate a large amount of metabolic waste, which is detrimental to the tissue and can even lead to necrosis in severe cases. Erections must be relaxed and relaxed.
