“not a man on the earth.” The daughter uses hyperbole (exaggeration) to make it seem like she and her sister were being forced to have incest. Her exaggeration is a lie. At a time when a man could have multiple wives, the city of Zoar that they had just left no doubt had men. Furthermore, there were many other men available, such as in Abraham’s camp, which was not very far away—perhaps about a day’s journey. Life in Sodom had apparently skewed the daughter’s morality. “Do not be deceived: ‘Bad company corrupts good morals.’” (1 Cor. 15:33).
“come into us.” The graphic but common way of speaking of sexual intercourse.