The penis size of 14 12 healthy young men in China and the penis erection length of 126 healthy men were measured. The results show that the longest is 14.5 cm, the shortest is 4 cm, and the average is 8.375 cm. Maximum circumference 12 cm, minimum 4.5 cm, average 8.3 cm. The longest 16 cm and the shortest 12 cm during erection. Maximum circumference during erection 14 cm, minimum 8 cm, average10.75cm.. Another survey on penis length of 1000 normal adult males is that the normal length is between 4.9 and 8.6 cm, with an average of 6.55 cm, the longest is 10.6 cm and the shortest is 3.7 cm. The penises of 2547 male college students aged 0/6 ~ 40 years old were measured, with an average length of 7.43 cm and an average circumference of 8. 17 cm. The average penis elongation is 13.34 cm, which is close to the calculated erection length 13.08 cm, so it can represent the length after erection.
It can be seen that there are some differences in the measurement results of different authors, and the results are also influenced by regions and nationalities. In addition, the penis length of the same person is not fixed under normal circumstances, such as tension, cold or severe fatigue will shorten the penis. In addition, the measurement methods themselves are quite different, so it is difficult to judge whether the penis is normal simply from the length. So the above figures can only be used as a reference. What is a real penis? The penis is shorter than 2.5 cm before puberty and 5 cm after puberty, with abnormal development and no erectile function; In particular, secondary sexual dysplasia, sexual dysfunction, infertility and azoospermia can be considered as abnormal penile development.