Before revision: Open wounds or damaged mucous membranes can turn typically low-HIV-risk sex acts such as oral sex into much-higher-risk sexual activity unless all HIV-positive participants are undetectable on HAART, or all HIV-negative participants are taking TRUVADA for pre-exposure prophylaxis in strict accordance with prescription instructions.
After revision: Open wounds or damaged mucous membranes can turn typically low-HIV-risk sex acts such as oral sex into much-higher-risk sexual activity unless all HIV-positive participants are undetectable on HAART, or all HIV-negative participants are taking pre-exposure prophylaxis in strict accordance with prescription instructions.