Homosexuality is prone to AIDS because sex between people of the same sex is generally special and most of them come into contact with the rectal mucosa. Its contact with the rectal mucosa makes it possible to break the rectal mucosa. Because the rectal mucosa is not a compound squamous epithelium, it is not exactly the same as this structure on the skin, nor is it exactly the same as the structure in the vagina. Therefore, it is easier to break the mucosa of the rectum by such a sexual act, and after the break, it will come into contact with the blood circulation. In this case, it is possible for HIV to enter the bloodstream, thus increasing the risk of HIV transmission. It is possible for HIV to be transmitted from male to male, and from female to female if there is rectal contact.