Which does not negate the fact that the virus can be transmitted through saliva. You were incorrect when you said it "Can't". Given the hyper politicization of the HIV virus, I would suspect that the possibility is even greater than stated.
Nobody has ever contracted HIV from kissing anybody, and that includes people in long term romantic relationships with HIV+ people.
I didn't realize you were an expert in pathology in addition to evolution of species (sarc). Given the fact that saliva is a possible transmission vector and the fact that there is no cure for aids, would you allow your kids to take that chance?
And you're worried about getting infected from being spat on?
Well, I didn't say that, but since you decided to bring it up, I wouldn't appreciate getting spat on in the first place. Saliva can contain all kinds of germs. Why do think it is impolite to not cover your mouth when you cough?
As an aside, if it is so difficult to get aids, why do the lobbies say "we are all at risk"?
Actually, the virus cannot be transmitted through saliva even though trace amounts are found in saliva because HIV needs a very high viral load to infect a person. The viral load in spit isn’t enough to infect anybody. Heck, most of the times (99.97%) it’s not even able to transmit through semen because the viral load is so low.
Oh, and to the person that wanted a “non-homosexual agenda” link about HIV, here you go.
http://www.cdc.gov/hiv/topics/basic/index.htm
The CDC itself says that HIV is a weak virus.