A kiss apparently is not just a kiss. An unromantic team of scientists has determined that the point of kissing is to spread germs and increase lovers' immunity and health. The bug cytomegalovirus, which is dangerous in pregnancy, is passed from smooching men to give a woman time to build immunity against it, reports the Telegraph. "Female inoculation with a specific male's cytomegalovirus is most efficiently achieved through mouth-to-mouth contact and saliva exchange," said the lead researcher. Way to kill the mood.