Men who have sex with men are more likely to get AIDS, a condition in which AIDS is transmitted through sexual intercourse. A man with AIDS and a normal man who has sex with men will come into contact with the mucous membrane of the rectum. The rectal mucosa is relatively fragile compared to the skin or the normal vaginal mucosa epithelium. It is very likely to have a small wound that ruptures as a result of such sexual activity, or as a direct result of having hemorrhoids. Contact with such a wound by bodily fluids from an AIDS patient can lead directly to blood circulation and thus to transmission. However, if it only comes in contact with the mucous membrane of the genital tract, because it is rare for the mucous membrane of the genital tract to have direct small wounds or breaks, the mucous membrane is also considered a barrier that can prevent body fluids containing HIV from entering the blood circulation, thus making infection less likely. Therefore, sex between men and men through the rectum is the key to the increased possibility of HIV transmission.