Genesis 19:32 Come, let us make our father drink wine, and we will lie with him, that we may preserve seed of our father.
Be aware of sin and temptation. Know that at any minute you could lose your testimony. It takes a lifetime to build a reputation that can be destroyed in seconds.
I think what disturbs me the most in this story is that they knew that they could mess up their dad so easily. They knew his weakness. They knew that they could get him drunk. They knew that he would get so drunk that they could do what they wanted.
I must be careful to always watch and pray so that I will not enter into temptation. I am no better man than Lot. I must be on guard.