Stop googleINGGG.... Saliva contains enzymes and proteins that inhibit HIV, so as such it is a deterrent rather than a medium of transmission, secondly when you type
www.medhelp.org something flashes on the top of the page which says Myths about HIV and there it is clearly mentioned that fingering is not a HIV risk.
For HIV to transmit through kissing you need a actively bleeding wound and then some blood from a infected person to get in the wound, but common sense tells me that if anyone has a actively bleeding wound that person himself wont try and kiss anyone coz of the pain...
So stop surfing the net.