Under normal circumstances, after the penis is erect, the glans will be naturally exposed, it is not necessary to turn the foreskin or glans over. However, if you need to artificially turn over the glans to reveal the glans, this situation is considered to be circumcision, it is advisable to turn over the foreskin to make the glans exposed, so as to avoid pain caused by friction in the process of sex. This is the time to use condoms not only to prevent pregnancy, but also to reduce the sensitivity of the glans. If the foreskin is too long and cannot be turned down sufficiently to expose the glans, it is advisable to seek medical attention for this condition. In addition, the foreskin is also prone to cause glansitis, premature ejaculation and other problems to sexual life, it is recommended to go to the urology department as soon as possible to perform circumcision for treatment.