The longest national penis in normal state is 14.5 cm, the shortest is 4 cm, the average is 8.375 cm; the longest when erect is 16 cm, the shortest is 9 cm, the average is 12 cm. when measuring precautions, you should hold the measuring tape tightly against the pubic bone, smooth the penis, the distance from the pubic bone to the head of the penis is the penis length. During sex, the most sensitive part of women’s vagina is the outer 1/3, the length of Chinese women’s vagina is usually 8 to 9cm, that is, if your penis can >3cm in erect state and has a certain diameter, you have the conditions to have a satisfactory sex life