Talk:Vampire/@comment-5335202-20121019140028/@comment-60.242.219.179-20121023105917

It if has to directly enter the bloodstream, then no. The mouth leads to the digestive system through the oesophagus at the back of the throat and the respiratory system through the trachea at the front; both of these are isolated from the circulatory system. However, some substances (e.g. alcohol) can be absorbed into the bloodstream directly through the stomach walls, so it's a bit of a tough call. Of course, the kind of chaste kissing that pervades Twilight won't see much saliva swapping...