Genesis 19:32, 33, 35 Come, let us make our father drink wine, and we will lie with him, that we may preserve seed of our father….And they made their father drink wine that night [v. 35, also], and the firstborn went in [v. 35, and the younger arose], and lay with her father, and he perceived not when she lay down, nor when she arose.
Both daughters of Lot responded to the Lord’s deliverance from the world by going back into the ”world.” They saw that their fiancés rejected salvation and did not come with them, and that there was no man left in the city for them to have children with. They wanted to preserve their name, their family, their legacy, and so they took matters into their own hands in a most disgusting way. The self was more important to them than morality or faith in God.
We might think that we would never do such a thing, but we still take matters into our own hands, instead of trusting the Lord and leaving it in His hands. We will often do whatever we can to promote self, even if it involves sin. It not always so easy or simple to just respond to grace and salvation by living our lives believing God and thanking Him. So we do what we can to hear the gospel often, respond with thanks and praise always, and pray with faith.