Is kissing risky?

Seriously though, if your question is "Should I believe deep kissing risky?" then, assuming for a moment that he is HIV positive, I would reply that this is not a risk unless he has just had dental surgery, has cancer sores, bad gums, oral herpes, or any other condition that would place blood or puss in his mouth? The same risk factors apply for your mouth as well. One way to reduce your risk of getting small cuts in your mouths would be to avoid flossing or brushing your teeth (use mouthwash instead) and avoid pointy foods like nachos.

Kissing someone on the cheek, also known as social kissing, does not pose any risk of HIV transmission. Deep or open mouthed kissing is considered a very low risk activity for transmission of HIV. This is because HIV is present in saliva but only in very minute quantities, insufficient to lead to HIV infection alone. Therefore, kissing does not pose a risk of acquiring HIV. However, it is generally good practice to avoid deep kissing if either partner has cuts, sores, or blisters in the mouth.

There has been only one case of transmission that can (possibly) be attributed to kissing. As this case was a real fluke, transmission by kissing appears to be a possible but extremely rare event. There has only been one documented instance of HIV infection as a result of kissing out of all the millions of cases recorded. This was as a result of infected blood getting into the mouth of the other person during open mouthed kissing, and in this instance both partners had seriously bleeding gums.