The foreskin and the head of the penis are physiologically and naturally adhered to each other. 3-4 years after birth, the penis grows, followed by intermittent erection, and the foreskin and the head of the penis gradually separate. 3 years old, about 90% of children’s foreskin can be retracted and turned up, before the age of 7, the foreskin is more long, covering the entire head of the penis and the urethral opening, by the age of 13 or so puberty since the development of the foreskin and the glans will separate on their own, it is easier to pull the foreskin to the back of the glans. Less than 1% of men have a prepuce at the age of 17. When the foreskin covers the urethral opening but can be flipped upward to reveal the head of the penis, it is called prepuce; when the foreskin opening is small and the foreskin is tightly wrapped around the head of the penis and covers the urethral opening and cannot be flipped to reveal the head of the penis, it belongs to prepuce. Due to the long foreskin and repeated occurrence of foreskin penile head infection caused by adhesions, the foreskin mouth formed scar narrowing, known as secondary prepuce. When circumcision can form a close adhesion between the foreskin and the head of the penis, and the head of the penis is locked by the foreskin for a long time, affecting the development of the head of the penis. When having sex, the foreskin may be stretched, resulting in painful intercourse, affecting the quality of sexual life and reducing sexual satisfaction; if the action is violent during intercourse, the foreskin may be forcibly turned up to the coronal sulcus and cannot be recovered, resulting in foreskin imbedding. If the foreskin is inlaid, it is an emergency. Patients will have foreskin congestion, edema and enlargement of penile head due to the obstruction of venous return of penile head, which may cause serious ischemia and necrosis of penile head if the treatment is not timely. In addition, the chance of penile cancer is much higher in patients with prepuce than those without prepuce, and the majority of penile cancer cases have prepuce or long foreskin. When the foreskin is too long or circumcised, the secretion of sebaceous glands in the foreskin cannot be discharged, and if it is not washed in time, the smelly foreskin scale will be formed gradually. The foreskin scale is suitable for bacterial growth, so it can cause inflammation of the penis head and foreskin. The adults do not have the habit of cleaning, not only their own susceptible to infection, but also make the woman bacterial or viral infection, resulting in vaginitis, cervicitis, and other more serious gynecological diseases, and even because the male penis head, circumcision recurrent attacks and female gynecological diseases can not be cured. How can I effectively prevent the formation of penis head and circumcision? The foreskin is often turned over so that the glans is exposed, and the foreskin is thoroughly turned over and cleaned when rinsing every day. This can effectively prevent infection. If you are still circumcised at puberty, you need to be circumcised in time. Circumcision is a small surgery in urology, but it is related to a man’s lifetime of “sexual well-being”.