HIV can be transmitted from anal sex and there is a greater risk of HIV transmission from anal sex than from vaginal sex. AIDS, also called acquired immunodeficiency syndrome, is caused by infection with the human immunodeficiency virus. In the early stage of HIV infection, patients will have fever, rash, swollen lymph nodes and other symptoms, if not through timely and regular treatment, patients may be combined with malignant tumors or serious infections, threatening life safety. AIDS is contagious, and sexual intercourse is one of the main ways of transmission of AIDS, including unsafe heterosexual contact, homosexual contact or bisexual contact. Without protective behavior, anal sex carries a greater risk of spreading the disease than vaginal sex. It is recommended to avoid high-risk sex in normal life, and if you suspect that you are infected with HIV, you should seek medical examination and treatment in time to avoid adverse consequences.