Sexual behavior that leads to the transmission of HIV is mainly high-risk sex, or clinically have multiple sexual partners, may lead to the transmission of HIV, so it is recommended to eliminate high-risk sex history, and must protect themselves. In addition, there is a window period of six months after HIV infection, that is to say, although already infected with HIV, but the clinical and laboratory tests will not show positive results, so it is recommended that if there is a history of high-risk sex, it is recommended that one month, two months, three months, four months, five months and six months after the high-risk sex, respectively, to carry out the appropriate examination, so as to find out whether it has been infected with HIV. Once a positive result is detected, it is recommended to intervene clinically and to avoid sexual intercourse because of the risk of transmitting the infection to sexual partners.