If the penis is 17.5cm long in the erect state, it is considered to be a normal in the long side level. The length of a man’s penis varies depending on his age, physical condition, region, ethnicity, and race. Generally, in adult men over 18 years old, the length of the penis in a weak state is 4.5 to 11cm, with an average of 7.1cm, and after erection the length can reach 10.7 to 16.5cm, with an average of about 13cm. Relatively speaking, 17.5cm would be a longer level, while if the length is less than 8cm, it is generally considered that there may be short penis. In short, due to individual differences, some people have a shorter penis, while others have a thicker penis, which is normal as long as it does not affect normal sexual life.