Sexual transmission of HIV mainly refers to unprotected sex. When a healthy person has unprotected sex with an AIDS patient, tiny breaks in the genitals of both parties may occur. Through these tiny breaks, the body fluids of the AIDS patient can enter the body of the healthy person. The body fluids of an AIDS patient have a very high viral load and can cause infection in a healthy person. To avoid HIV infection, you should avoid unprotected sex and use condoms as one of the most effective preventive measures during sex. In addition, you should avoid sharing needles or syringes with other people, and avoid unregulated interventional medical procedures, such as tattooing, tooth extraction, eyebrow tattooing, and so on.