Something Else Good about Kissing: It Spreads Germs

From its beginning, the act of kissing has become a nearly universal and natural expression of affection among people. However, scientists believe kissing was developed to spread germs which build up immunity to Cytomegalovirus, which, if caught while pregnant, can kill unborn babies or cause birth defects.

It isn't the most romantic theory, but scientists believe kissing was developed to spread germs which build up immunity to illness.

They say the gesture allows a bug named Cytomegalovirus, which is dangerous in pregnancy, to be passed from man to woman to give her time to build up protection against it.

The bug is found in saliva and normally causes no problems. But it can be extremely dangerous if caught while pregnant and can kill unborn babies or cause birth defects. Read more