Larger condom models can cause condoms to move forward, which is normal, but there are certain hidden dangers that affect many of the condom’s roles, suggesting the need to replace them with other models. You should try to avoid the occurrence of condom forward movement to ensure safe sex and protect your own health and that of your partner. A, adverse consequences: 1, contraceptive failure: condom forward, the male ejaculate will overflow from the condom, into the female vagina, if the sperm and eggs combined successfully will cause an unintended pregnancy. It is recommended to take emergency contraceptive pills as soon as possible when the phenomenon is found, such as no fertility needs, after taking it, although it may cause nausea, vomiting, menstrual disorders and other symptoms, but the abortion procedure after an unwanted pregnancy has more irreparable harm to the body and should be avoided as much as possible; 2, cause diseases: some sexually transmitted diseases such as syphilis, gonorrhea, HIV are transmitted through direct contact between the penis and the vaginal mucosa or sperm carrying the virus transmission. Therefore, if risk factors exist after the phenomenon, you should immediately go to the hospital to do the relevant examination to avoid the occurrence of disease. Some women who are allergic to semen may experience allergic symptoms such as edema, vulvar itching, shortness of breath, etc. If there is a severe allergy, they should go to the hospital immediately for treatment. If the condom is moved forward too much or even may fall off, poor personal hygiene in men and foreskin scale may cause gynecological problems. Women’s gynecological problems are also likely to be transmitted to men because of this situation, the emergence of inflammatory diseases should be treated with oral antibiotics and antibiotic ointment, and need to follow medical advice. Second, precautions: 1, the correct choice of model: choose the width of the condom with the penis, too tight will make the penis discomfort, too loose will lead to fall off; 2, pay attention to observation: during sex purposefully pay attention to the degree of fit of the condom and the penis and whether it is displaced, if the tendency to move forward should be corrected in time, during sex condoms repeatedly fall off should consider replacing the small size condom.