Oral sex without a condom carries the risk of transmitting HIV, and it is usually not recommended for healthy people to have this type of sex with someone who has HIV in order to avoid spreading the disease. The main modes of transmission of AIDS currently include sexual contact, blood transmission, and mother-to-child transmission. AIDS is an infectious disease caused by the infection of the human immunodeficiency virus (HIV). The virus mainly exists in the blood, semen, vaginal secretions, cerebrospinal fluid, pleural and abdominal fluid, amniotic fluid and breast milk of the infectious agent, and a small amount of the virus is also contained in the saliva, so that if you have oral sex without a condom with a person suffering from AIDS, you will have the opportunity to be infected with the human immunodeficiency virus and spread AIDS. Although the saliva of an AIDS patient contains less human immunodeficiency virus, if there is damage to his or her oral mucous membranes that bleeds, the blood of the AIDS patient contains more of the virus and is more likely to spread AIDS. Therefore, it is usually not recommended for AIDS patients to have oral sex, anal sex or sexual intercourse without condom, etc. It is recommended that patients suffering from AIDS actively take reasonable treatment under the guidance of professional physicians and avoid unhealthy sexual behaviors.