Condoms can prevent some HIV infections. HIV can be transmitted through sexual intercourse. If one partner is a person with HIV and the other is a normal person, then during sexual intercourse, if protection measures such as condoms are not used, there will be some contact of bodily fluids, which will come in contact with the mucous membrane of the genital tract. If a condom is worn throughout, the corresponding contact of bodily fluids can be avoided. Other bodily fluid contact may occur in saliva. As long as the saliva of AIDS patients does not contain blood from the bleeding gums in the mouth, it will not lead to the transmission of AIDS. After wearing a condom, there will not be an exchange between the mucous membrane of the genital tract and the secretion, so this situation can basically avoid the transmission of AIDS. However, whether the condom is qualified or not, and whether there is contact with other wounds and mucous membranes in the process of sexual intercourse, is also an aspect of whether AIDS transmission can be avoided.