The hazards of not wearing a condom include unplanned pregnancy, infection with sexually transmitted diseases and inflammation of the female vagina or the male glans, and so on. 1. Unplanned pregnancy: Condoms are mainly used to prevent pregnancy by blocking the combination of sperm and egg. However, if both husband and wife do not wear a condom during intercourse, it is very likely that an unwanted pregnancy will occur, resulting in unnecessary abortion. 2. Infection of sexually transmitted diseases (STDs): Syphilis, gonorrhea, and AIDS are the most common STDs transmitted through sex. If one of the spouses has multiple sexual partners or unclean sex, it is very likely to be infected with sexually transmitted diseases. 3. Female vaginal inflammation or male glansitis: wearing condoms can also effectively prevent cross-infection of inflammation, thus reducing the occurrence of female vaginal inflammation or male glansitis. If there is no pregnancy plan, it is recommended to take contraceptive measures. If you have abnormalities such as abdominal pain or vulvar itching after sex, go to the hospital in time to avoid delaying your condition.