04% per act or, in theory, about 4 cases of HIV transmission per every 10,000 acts of vaginal sex with a woman who is
HIV positive) and male-to-female (.08% per act or 8 cases of
HIV transmission per every 10,000 acts of vaginal sex with a man who is HIV positive) transmission estimates in high-income countries show a low risk of infection even when the person with HIV is not on antiretroviral treatments.
https://www.hivlawandpolicy.