Probability of contracting AIDS by unprotected vaginal intercourse with HIV-infected persons/patients: Theoretically, the probability of unprotected sexual intercourse between HIV-positive women and healthy men is only1/500- 11000, that is, healthy men will be infected after 500-1000 unprotected sexual intercourse. The probability of HIV-positive men being transmitted to healthy women through unprotected vaginal intercourse is 1/300- 1/500, that is, healthy women will be transmitted to HIV men after 300-500 unprotected sexual intercourse. But this is just a theory. In real life, the infection rate of sexually transmitted diseases among unsafe workers is high. If there are genital ulcers and injuries, the probability of unprotected vaginal intercourse infected with AIDS will increase by 20 times! In addition, women's physiological structure is more susceptible to AIDS than men. If it is gynecological inflammation, cervical erosion, physiological period, hymen rupture, sexual violence, etc. , will increase the probability of women infected with AIDS.
The probability of HIV infection by unprotected anal sex with HIV-infected persons/patients: the probability of passive HIV infection can reach1100, and the probability of HIV infection among inserters can reach 1/800 or more. Even so, there are still many unpredictable risks, such as the high infection rate of sexually transmitted diseases among gay people and the injury of genital ulcers, which are acceptable.
The probability of HIV infection through oral sex with HIV-infected people/patients without using condoms: Oral sex is a way with low probability of HIV infection, and the infection probability of those who receive oral sex is twice as low as that of those who have oral sex. The HIV infection rate of oral sex workers is110000, and that of oral sex workers is 1/5000, which means it takes 5000- 10000 oral sex to get HIV infection. This is just theoretical data. In real life, the HIV infection rate of oral sex greatly exceeds people's expectations. A survey of gay men infected with AIDS in the United States shows that 8% of AIDS infection in this group comes from oral sex.