It is true that having many sexual partners makes you more likely to be infected with HIV. Because sexual transmission is the main mode of HIV transmission, most people with HIV are infected sexually. In reality, if one knows that one’s sexual partners are not infected with HIV, an increase in sexual partners in this case will not lead to HIV transmission. In reality, however, if there are more sexual partners, one will not know particularly well about the sexual partner and will not be sure if he is infected with HIV. For people who have only one sexual partner, the possibility that the other person is not HIV-infected is roughly certain, while if there are more sexual partners, the possibility that there are HIV-infected people among sexual partners rises significantly, and the possibility of transmitting HIV to oneself increases.