There are as many differences in the length, shortness and size of the human penis as there are in your height, fatness and size of your features, and are influenced by race, region and other factors. Also the length of the penis is not necessarily proportional to the height. In recent years, domestic survey statistics on the size of the normal adult penis: the size of the penis: the average total length of 7-10cm when flaccid (about 14-18cm when erect). Penis length is 4.5-8.6 cm, average 6.55 cm, transverse diameter is 2.06-3.08 cm, average 2.57 cm; stem middle circumference is 7.02-9.42 cm, average 8.22 cm. height is not related to penis length. The findings in Lanzhou area were: the average length of penis was 8.08 cm and the circumference was 8.3 cm. The findings in Zibo City, Shandong Province on 864 Han adults were: the average length of penis was 7.7 cm, the average transverse diameter was 2.13 cm and the circumference was 6.69 cm. The relationship between penis length and transverse diameter and age was also analyzed. It was concluded that penis length and transverse diameter were age-related, and that the length and transverse diameter of penis of those aged 28-48 years were greater than those of other age groups. There was a significant difference in penis length between the three surveys. These three surveys basically reflect the profile of adult men’s penis in different regions of China. The average total penis length of Japanese and Soviet people is 15.5-21.5 cm. the development of overly obese people may be shorter penis, which is related to the local accumulation of excessive fat to cover. The penis has two main functions: one is urination; the other is sexual activity. The length of the penis generally does not affect urination, because the current method of measuring the length of the penis itself there are differences, so the number of these can only be used as a reference, do not “right”. Generally speaking, as long as the penis can be erected normally, the testicles and other internal genital organs have normal functions, and the penis is greater than 3 cm at room temperature and in a weak state, it generally does not affect sexual life. However, if the length of the penis is less than 3 cm, and the development is not normal, there is no erectile function, especially accompanied by male secondary sexual characteristics dysplasia, it can be considered as penile dysplasia, and the cause should be identified at the hospital . If you have reached the growth period, from the perspective of growth and development to check whether the standard is in the standard value, if there is a difference, there is no need to worry about these heavy, should identify the cause; medication, in the local regular government hospital specialist to do some detailed consultation, do not go to the street to buy “black” medicine, which is not only hurt the body, but also difficult to achieve the results you want. It is difficult to achieve the results you want.