My kids kiss me on the lips all the time, but I usually kiss them on their checks or forehead. I just feel a bit awkward. My parents had coldsores when we were growing up so I guess it's just habit that I don't. My parents managed to avoid giving us coldsores and I don't like other people kissing my kids on the lips for this reason though I think coldsore viruses can be passes on by kissing in general, not just on the lips.