Oral sex without a condom is generally not contagious, but this should not be absolute and should be considered on a case-by-case basis. If a person with AIDS gives oral sex to another person, the amount of HIV in the saliva is extremely small and basically does not cause transmission. However, if there is slight gum bleeding and the saliva contains a slight amount of blood, the level of HIV will rise significantly and contact with another person’s mucous membrane may cause infection. If there is some small wound on this mucous membrane, the probability of infection is even greater. If a person who does not have AIDS gives oral sex to an AIDS patient, his oral mucosa will come into contact with the vaginal secretions or semen of the AIDS patient, and the amount of HIV in these two fluids is also relatively high, and contact with the mucosa of a normal person is likely to cause infection.