If there were sores in a person's mouth, herpes, even AIDS possibly, I believe. Not to mention colds, the flu, strep, measles, you name it. If there are any doctors in the house, please correct me if I'm wrong... But... Man, I wouldn't want my kids taking part in something like that!
I'm not a doctor but you are not wrong. Some STD's are more easilly transmitable than others. In health care facilities patients dieing of Syphilis or related illness are handled with caution when it comes to contact. You have to be reasonably careful not to come in contact with their body fluids.
I'm trying to get over a huge horrible nasty cold right now. Our school had so many absences over the last month due to this nasty cold going around. This is cold and flue season. That alone should have made someone think twice about this experiment. I mean after, of course, the basic EWWWWWWWWWWWWWWWWWWWWW factor of the whole thing.
But then again, who said Liberals ever think.