Why does the penis become smaller when you are nervous or just finished exercising? It is the size of a six-or seven-year-old child's penis. Under normal circumstances, the penis is only 2.5 cm.

The reasons for the change of penis length are as follows: the penis is mainly composed of three spongy soft tissues, and its length changes through the amount of congestion. However, our mood fluctuation, the change of body metabolic rate and the change of external environment temperature will all lead to the contraction or expansion of local blood vessels in the body, which will lead to the change of blood flow in blood vessels. Therefore, when you are stimulated by positive emotions such as excitement or sexual desire, and the external temperature is high, it will lead to the expansion of penis blood vessels and the increase of blood circulation, thus increasing the blood content of penis and making penis bigger; On the contrary, when you are frightened, in negative emotions such as nervousness and fear, and when the weather is cold after exercise and the metabolism in the body is accelerated, the blood vessels in the penis contract strongly, resulting in a sharp decrease in blood supply to the penis, and finally the penis becomes smaller and smaller. So when you ask, "Why does the penis get smaller when you are nervous or just finished exercising?"? It is just as big as the penis of a child of six or seven years old, and it is 2.5 cm when it is normal. " Because the sympathetic nerve is nervous, it will be very excited, which will lead to strong contraction of blood vessels and a sharp decrease in blood supply to the penis. After exercise, the metabolism of the body will be accelerated, the blood circulation will be accelerated accordingly, and the workload of the heart will be greatly increased. At this time, the blood supply to the penis will be reduced accordingly, which will of course lead to the penis becoming shorter.