Thanks for your question. HIV is not transmitted through saliva. Oral sex is a very low risk activity for transmission of HIV. The person whose throat is exposed is the one who is most at risk. However unprotected oral sex is a very common way for syphilis, gonorrhea and chlamydia to be transmitted. You may find the Oral Sex Risk chart helpful at
https://smartsexresource.com/sites/default/files/Oral-Sex-Table-v3.png
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