Kissing dogs?

This weekend Anthony asked me if after I kiss daddy do I get sick. I said, "No why?" He said because we would catch each others germs. Last night Carysa was over they were running around the house playing dog/dog catcher. They asked for a drink. I told them to fill a bowl with water. Anthony asked if they would need to have separate  bowls so they wouldn't catch each others germs. Me, not wanting any extra dishes to clean said "No, you two play together so much you probably already have each others germs." Anthony says, "so that means we can kiss?" Carysa said, "Oh no it doesn't!"