The general standard of male circumcision is that the head of the penis cannot be exposed or is only partially exposed when it is not erected, as explained below. The most important cause of phimosis is caused by heredity. Phimosis can be categorized into two types, one is true phimosis and the other is false phimosis. The phenomenon that the glans cannot be completely exposed even after the penis is erected is called true phimosis. False phimosis means that although the glans cannot be fully exposed in normal times, the glans can be fully exposed when the penis is erected. The phimosis can affect men’s health, and if you don’t pay attention to hygiene, there can be a lot of dirt hidden under the foreskin, which will also affect the health of your partner. If you are circumcised, it is recommended that you undergo circumcision before marriage before you start having sex. If you have sex without treatment, you should clean the penis before intercourse and wash it after intercourse; in addition, during intercourse, the action should not be strenuous, so as to avoid the occurrence of incarcerated prepuce or laceration of the tethered ligament.