There is no set gold standard for men’s penis size. A man’s penis length should be around 8.8 centimeters without erection, and can reach about 12.9 centimeters after erection, which is generally considered normal. Penis length refers to the position from the root of the penis to the opening of the urethra, and is measured from the pubic symphysis to the opening of the urethra, trying to exclude the influence of subcutaneous fat and surrounding tissue. The length of a man’s penis can be categorized into flaccid length as well as erect length, and there is no set gold standard for penis size. There are significant individualized differences in penis size and length, as well as some correlation with race. As long as the couple is satisfied with their sex life, there is no need to be concerned about penis length. If the penis length is abnormal due to pathological factors, it is recommended to consult a doctor in time.