Why not? It is the Bible, after all, and it tells us how to lead our lives (or so those who've hardly read it tell us).
After the destruction of Sodom and Gomorrah, Lot and his two daughters take refuge in a cave in the hills (Genesis 19:30). The daughters are concerned that they will not find husbands, so each in turn gets her father drunk and has intercourse with him. They both become pregnant and each bears a son.
Although the episode appears as a direct sequel to the destruction of the cities of the Plain, it is really an independent folk tale, and the Lot here originally had no connection with Abraham's nephew. He may well have been identified with a local spirit of the cave where he was supposed to have taken refuge.
The story is primarily an explanation of the origins of the peoples of Moab and Ammon, lands to the east of Israel. The elder daughter bears a son called Moab, who is the ancestor of the Moabites; and the younger has a son called Ben-ammi, the ancestor of the Ammonites. The sons' names are explained by popular etymology as meaning respectively "From father" and "Son of my kin".
The story may be an Israelite gibe at the supposed origin of two of their neighbours. But it seems more likely that the account is of Moabite and Ammonite origin, and that the action of Lot's daughters was originally seen as positive; a way to ensure that their descendants had no foreign blood.
Whatever its source, it serves to demonstrate that these peoples were not direct descendants of Abraham, and had no claim to the land west of the Jordan. The Israelites believed that God had covenanted that this land was for the direct descendants of Abraham only (Genesis 12 onwards).