Put the condom on after the penis is hard and before the penis touches the vagina or anus.
A combined analysis of all studies of HIV-transmission risk undertaken to date in high-income countries has found that unprotected vaginal intercourse with an HIV-positive man who is chronically infected and not on antiretroviral treatment ART carries an estimated 0.
Take the penis out of the vagina or anus right after ejaculating.
There is a higher risk of passing HIV on to others in the first few months after infection as there are high levels of the virus in bodily fluids at this point.
Having a 1 in 70 chance of transmitting HIV does not mean it takes 70 exposures to the virus in order to seroconvert.
Women are thought to be at a greater risk than men of acquiring HIV during vaginal intercourse for the following reasons:
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