When Luke and Laura dated in 'General Hospital' when I was a kid I was very excited. And that was a rather pathetic relationship if you break it down because let's face it: he raped her... and then they got married. There's all kinds of things that TV does to relationships.
With our knowledge of modern-day genetics we realize that it was possible for God to place the potential for all people throughout history into the genes of Adam and Eve when He created them.