Condoms can prevent HIV to some extent. HIV is mainly found in the body fluids of infected and sick people, such as blood, semen, vaginal secretions, breast milk, urine, and saliva, and can be transmitted through contact with the body fluids of HIV. There are three main ways of transmission: the first, blood transmission, mainly blood transfusion and blood products. The second, sexual contact transmission, including same-sex and opposite-sex contact. The third, mother-to-child transmission. By using condoms, the exchange of semen and vaginal secretions can be prevented, so to a certain extent, AIDS can be prevented.