To say that people have been falling love since Adam and Eve is utterly false. There was no Adam or Eve. We are all born with the capability. Whether we get it or not makes a definite mark on us as babies, pre teens, teenagers,etc on onto adults. Do some reading about the subject based on proven scientific fact, go on the internet into orphanhages all over world and see for yourself what happens to babies and young children who have no one to love them, they don't live long. If no one ever loved you, you would not be here asking. For a more scientific answer beyond what I said someone else will read what I wrote and perhaps elaborate on it.