Quote (tumtum4 @ Sat, Sep 12 2009, 09:31pm)
# Scientists believe that kissing may be a way of exchanging body salts or sebum that form relationships with parents and lovers, just as it does some birds. During mating, some birds chew food, then kiss-feed it to a prospective mate. If a bird’s sebaceous glands are removed so there is no sebum, its mate flies off.j