Recently the male circumcision becomes a hot issue not only in abroad but especially in Korea. Under this circumstance, it will be right that doctors and scholars restart to study about the merits and demerits of male circumcision. There is no clear answer yet about its advantages and disadvantages in sexual transmitted disease. The only issue is that WHO and UNAIDS admit the male circumcision as significant precautionary measure against HIV after finishing a large scale study. However it will be difficult to follow the Western statistics impetuously since the course of diffusion of HIV is different from USA, and there is no any study in Korea about the merits and demerits of male circumcision. Therefore we conclude that it will be a impetuous assertion to argue that the male circumcision should be done before the adolescence, before starting an active sexual life, without any countermeasure.