How long is the boy's brother?

How long before a man's "brother" is normal?

The average length of penis in normal men in China is 1 1cm when erect, and 5-6cm when weak. How did you get it? Then look:

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 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 et al. measured the penises of 2547 men aged 16-40: the average length was 7.43 cm and the average circumference was 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. (Why? See scientific measurement below! )

It is also suggested that the penis matures at 16 years old, and it still grows after 20 years old, and there is no significant difference after 25 years old. Its size is influenced by many factors such as age, development, region, nationality, race and physical condition.