Chinese Kissing

The other day, Kai was noticing that the dogs were licking each other. Their tongues touched and Kai started laughing and said..."Look at the dogs, they are Chinese Kissing." I asked him what he meant by that and he explained that when dogs touch tongues it's called Chinese Kissing. He also explained that people sometimes Chinese kiss too and it's gross. I asked him where he heard that from and he said..."I didn't hear about it at school, I heard about it from an adult. Either you or Dad." :)