Read Chapter 19 of Genesis

It tells how perverse the men of Sodom had become. God had sent two angels to Lot's house. Spending the night in Sodom, for these angels, would have been like a tourist walking through Central Park in New York.

It is hard for us to understand how a father would ever offer his daughters to a mob of rapists. It is good that his offer didn't satisfy them because the angels called blindness on them and they were all able to escape from the city.