Why do men have large and small penises?

Penis length in men is mainly determined by genetic factors and varies in different individuals.
Normal male penis length varies greatly. The determinants of penis development are congenital factors such as heredity, and some acquired factors such as lack of some trace elements such as zinc, as well as androgen secretion abnormality caused by excessive obesity in males can also affect penis development and lead to penile hypoplasia.
In addition, in adult men, due to obesity, the perineal fat covers the root of the penis, making its length visually shorter. Generally speaking, the length of a Chinese male’s penis reaches nine centimeters after erection, and its diameter is three centimeters, which is considered normal.
During the process of development, men should pay attention to the adequacy of food types, and can gradually carry out some sports with intensity. Develop good living habits, strictly abstain from smoking and reduce alcohol consumption. If, as an adult, the penis is underdeveloped and the length is abnormal, please consult a urologist to identify the cause and correct the problem.