The size of the penis usually refers to its length and thickness. Just like the height of a person, the size of the penis varies from person to person. Does penis size have an effect on sexual function and sex life? Many people mistakenly believe that a short penis will affect sexual function and worry about producing impotence; there are also some patients who visit the clinic for sexual dysfunction and blame their patients on their short penis. In fact, the occurrence of penile erectile dysfunction has nothing to do with the size of the penis. Generally speaking, the penis, regardless of its size, can obtain a satisfactory sexual life as long as it can be erected normally. In clinical practice, we can see some patients who have been partially removed due to penile cancer can still maintain good sexual function and lead a normal sexual life with normal erection, and some of them can even have children. Therefore, sexual function is not directly related to the size of penis. In addition, from the point of view of female anatomy, the size of the penis has little effect on vaginal sensation and pleasure. The female vagina is very flexible and can adapt to different sizes of penises. During sexual intercourse, it is the hardness of the erection that affects sexual pleasure. Also, the deep part of the vagina is less sensitive to penile stimulation. In women, all vaginal nerve endings are concentrated in the outer 1/3 of the vagina and at the vaginal opening, and there are almost no sensory nerve endings in the inner 2/3 of the vagina. In addition, during sexual intercourse, the penis and vagina rub together and stimulate the clitoris, labia minora and vaginal opening to make women get pleasure. Moreover, the vagina is elastic and normally expands only to the size suitable for male penis. Therefore, there is no need to worry about the small size of the penis, as long as the penis can be erected and enter the vagina for sexual intercourse, it meets the criteria. The function of the penis is the same regardless of its size.