Penile erection is actually a neurovascular response. External stimuli act on the penis through two nerve conduction channels, causing an increase in blood flow into the penis and a decrease in outflow, and an increase in intracavernosal pressure to induce an erection. The specific mechanism is as follows: under the stimulation of audiovisual, olfactory, tactile and/or hallucinatory sensations, the central nervous system emits sexual impulses, which are transmitted to and from the penis via the sacral medullary center and peripheral nerves (psychosomatic erection), or by stimulation of the external genitalia; the impulses cause parasympathetic excitation of the penis via the penile sacral medullary reflex arc (reflex erection), resulting in relaxation of the smooth muscles of the penile cavernous arteries and the penile cavernous sinuses, increased blood perfusion in the penile corpus cavernosum, and decreased venous return. When the blood pressure in the cavernous body of the penis rises to a level almost equal to the blood pressure in the arteries of the body, a firm erection is produced. Penile erections are usually divided into the two categories mentioned above. These are psycho-psychological erection and reflex erection. Psycho-psychological erection is caused by stimulation of the brain from various sensory organs such as sight, sound, smell, touch or thought and imagination, and this kind of erection occurs in the waking state. Reflex erection is caused by stimulation from external genitalia and/or internal organs, which can occur in the waking state or sometimes during sleep. The two reflexes can occur synergistically or independently. It is well known that age is an important indicator of male sexual function. According to statistics, the male libido is generally at its peak at the age of 18-25, and penile erection is also at its best at this time, with the increase in age, androgen reduction, nerve and skin response is slow, poor blood circulation in the sex organs, life stress, psychological aesthetic fatigue (such as African men, frequent sex), etc. make alone rely on mental psychological erection often does not work, at this time often need to combine The stronger the external genital stimulation outside to get a better erection. It is recommended that patients: a. Develop good habits, quit smoking and drinking, maintain good sleep, appropriate self stress reduction, maintain a good mood; b. Change the fixed time and place of sexual life, to obtain a certain sense of freshness, thereby reducing aesthetic fatigue. Third, more communication with the lover during sex, more caress, not only with the help of fatigue visual, but also with the help of hearing, smell (such as the lover’s body coated with their favorite perfume), etc., through caress to improve tactile stimulation, thereby improving erection; Fourth, go to the regular hospital as early as possible, and under the guidance of doctors reasonable medication to obtain a satisfactory sex life.