There is no uniform standard about the size of penis.
Shi has measured the penis size of China 14 12 healthy young men and the penis erection length of 126 healthy men. 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..
The penis length of 1000 normal adult males investigated by Liu Guozhen et al. is: the normal length is 4.9 ~ 8.6 cm, with an average of 6.55 cm, the longest is 10.6 cm, and the shortest is 3.7 cm. Wu Weicheng and others measured the penises of 2547 male college students aged 16-40, 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 the elongation 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 constant under normal circumstances, such as tension, cold or severe fatigue, which 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.
Therefore, the above figures can only be used as a reference, and never try to compare your own length.
The penis is shorter than 2.5 cm before puberty and 5 cm after puberty (some people think it is 4 cm), with abnormal development and no erectile function; Especially the secondary sexual development, sexual dysfunction, infertility and azoospermia. At this time, it can be considered as abnormal penile development.
For women, the sensitive part of the vagina is in the anterior segment of the vagina (1/3), and the vagina has a "tight grip" on the penis during sexual intercourse, so their sexual pleasure has a certain relationship with the penis thickness, but not with the penis length. Therefore, as long as the penis size is within the normal range, there is no need to worry!