If their viral load is undetectableĪ person with an undetectable viral load can’t transmit HIV, so carry on. PrEP reduces the risk of contracting HIV from sex by 99 percent, and fellatio is already considered a lower risk pleasure. If you’re taking PrEP as prescribed, you probably have nothing to worry about. How long the semen sits in the mouth before being swallowed affects your overall risk, too. Things, like the viral load of the person whose fluids are being swallowed or whether the person doing the swallowing is taking pre-exposure prophylaxis (PrEP), affect the overall risk level. The chance of contracting HIV from swallowing varies from one situation to the next.
