The prevention of HIV can be done through medication or by using condoms. When engaging in sexual activities, if it is unclear whether the other party is infected with HIV, it is crucial to use a condom. The quality of the condom should be good. Additionally, when using a condom, it must be worn correctly to cover the genitals. Besides using condoms, if unprotected high-risk behaviors occur, it is necessary to take HIV antiretroviral drugs as soon as possible after the behavior, and no later than 72 hours afterwards.