The male urethra differs from the female urethra in that the male urethra has two functions: urination and seminal discharge. The male urethra is generally longer, about 16-22 cm long, and has two bends, the inferior pubic curve below the pubic symphysis and the anterior pubic curve below the anterior pubic symphysis. The inferior pubic bend is generally fixed, and the anterior pubic bend can disappear when the penis is erect or when the penis is lifted upward, so the male urethra is not susceptible to bacterial infection and is not prone to urethritis and cystitis. In addition, there are three other strictures in the male urethra, which are the external urethral opening, the urethral membrane and the internal urethral opening. Therefore when doing catheterization, cystoscopy or urethral dilation, attention should be paid to these anatomical features to prevent damage to the urethra.