Close to 100% from a male positive carrier to a non-infected female. HIV is transmitted through the following body fluids:
Blood
Semen
Pre-cum
Rectal fluids
Vaginal fluids
Breast milk
Studies have demonstrated that male-to-female HIV transmission during vaginal intercourse is significantly more likely than female-to-male HIV transmission. In other words, HIV-positive men are much more likely to transmit the virus to HIV-negative women through vaginal intercourse than HIV-positive women are to HIV-negative men.
Vaginal sex is just as risky as being the male ‘catcher’. Both areas are lined with mucosal tissue where the virus easily enters.
Here… read this: https://www.poz.com/basics/hiv-basics/hiv-transmission-risks