It is not normal for the condom to move forward, indicating that the condom is not the right size and is a safety hazard. Condoms come in different sizes, generally the width of extra small condoms is 48±2mm, small condoms are 50±2mm, medium condoms are 52±2mm, and large condoms are 54±2mm. It is important to choose the right model when using condoms, if you choose a size that is too large, it will result in the condom being too loose, which will easily lead to the condom shifting forward, and you will need to replace it with a different model that is suitable for the situation. The forward movement of the condom will easily lead to sperm overflow, which may result in contraceptive failure. Therefore, you should choose the right type of condom and try to avoid the occurrence of condom forward movement to ensure safe sex and protect your own and your partner’s health.