The penis is an important part of the reproductive organs of males and male mammals, and consists of the corpus cavernosum of the penis and the corpus spongiosum of the urethra, which is mainly used for sexual intercourse, ejaculation and urination. The size of an adult male’s penis is usually around 4.5-10cm when it is soft, and varies according to ethnicity. The size of the penis is swollen due to the congestion of the corpus cavernosum during sexual stimulation, which makes it possible to satisfy the needs of sexual intercourse and sexual life. The size of the penis generally has nothing to do with the length of sexual life, so the majority of men should not feel inferior because of the length of the penis, thus affecting their sexual experience.