The length of a normal male penis without erection is usually more than 4 centimeters, and the length of an erected penis is 8 to 17 centimeters, which is normal. Sexual ability depends on the hardness and duration of the erection during sex, and not entirely on the length of the penis. In the case of not affecting the quality of married life and not delaying the conception of the situation can be completely do not have to pay attention to the length of the penis, if it affects the life of the couple of people, can be treated through the penis lengthening operation, but the operation is only the original encapsulation of the penis to show, and can not prolong the length of the erection. After the operation may also lead to congestion, edema and other symptoms appear, does not affect the sex life of the people, not recommended for penis extension treatment.