Men who have sex with men are more likely to get AIDS because one of them is living with AIDS and the other is not. If neither person is HIV positive or both are HIV positive, there is no question of whether HIV is more likely to be transmitted. Sex between men who have sex with men is likely to come into contact with the rectal mucosa, which is not a compound squamous epithelium, so it is more fragile and is likely to cause minor damage if the sexual practice of anal sex is applied. And some people have hemorrhoids, which are likely to bleed easily themselves. In this case, HIV comes into direct contact with these small wounds and enters the blood circulation, making it even easier to cause transmission. In contrast, the vaginal mucosa is underneath a layer of squamous epithelium, which is more pliable, and normal physical stimulation does not lead to small wounds, so the possibility of HIV transmission is much smaller. If you are having anal sex with someone of the opposite sex, the possibility of HIV transmission increases.