The story you might find interesting is of Noah in the Old Testament. It seems that Noah's wife died and only his two daughters were left. No other humans were on earth after the flood. Noah's daughters who were young took it upon themselves to get their father drunk and to sedduce him into going into them. Thus the human race survived. I don't have a daughter so the story doesn't become a open door to me. Taboos and morals and laws of today reflect substantial prejudice against such an outcome. Your story compares and contrasts these changes.