Male genital organ length differences are relatively large, in general, the penis length in Europe and the United States are greater than Asian men, as Asian men, the penis in a weak state > 7cm, erect state > 10cm is normal. Sexual success or not, the length of the penis is one of the reference indicators, even if the penis is slightly short, as long as there are no special problems in other areas, the couple is satisfied, there is no greater relationship. In addition to the length of the penis, the circumference, hardness and duration of the penis are also the main reference indicators of the success of sexual life.