The Most Inexplicable Thing I've Ever Heard About

Lot and his family are in a little town called Zohar. Then they leave Zohar and run up into the mountains. His two daughters decide to do the most inexplicable thing I've ever heard of in my life. They say to him, our father is old and there is not a man on earth to come into us after the manner of all the world. And so it is down to us to carry on the human race. To repopulate the earth.