The risk of passing on HIV through oral sex is very low unless the person receiving oral sex has an STI or sores on their genital area, or the person giving oral sex has sores in their mouth or bleeding gums. If the person with HIV is on medication and has undetectable levels of HIV, then there is no risk of passing the virus on.
However, other STIs can easily be passed on during oral sex, in particularherpes, gonorrhoea and syphilis. Certain infections and viruses that are found in faeces (poo) can be passed on through oral–anal sex this includes hepatitis A and E.coli.
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