WHY PEOPLE KISS

What happens when a man and a woman kiss?
That is to say, what happens to the various parts of the body when two people in love join their lips in bliss? Years ago, before our biologists knew of the existence of the glands in our bodies, one writer quoted a scientist as saying that "kissing is pleasant because the teeth, jawbones and lips are full of nerves, and when the lips meet an electric current is generated."