Chinese media companies are now spreading warnings about the dangers of kissing. It seems it is pretty easy for any kiss to blow out an ear drum because pressure can be imbalanced between the two ears, which can lead to one of the drums breaking.
Link Photo via Bob.Fornal [Flickr]
Do Not Kiss in the ear Only Mouth
Also, there's no mention of whether or not she already had ear problems, which would definitely affect something like this.