Get real, already.
A simple HANDSHAKE is as likely to spread or share the pathogens you cite, nevermind a KISS!
You sound as paranoid about simple common minor illness being spread by a rare sharing event as the drug warriors are about the EEEEEEEEVIL WEEEEEEED!
Come to think about it, where ARE the drug warriors? This is another outgrowth of their agenda, is it not?
I mean: children, drugs, illicit sharing of a controlled substance...
Does this not REEK of "legitimate" interference by BIG BRO?
Oh yeah, gotta watch out for these lezzes kissing