They DID??
You must have a KJV bible; as the NIV says:
Genesis 19:30-38
30 Lot and his two daughters left Zoar and settled in the mountains, for he was afraid to stay in Zoar. He and his two daughters lived in a cave. 31 One day the older daughter said to the younger, Our father is old, and there is no man around here to give us childrenas is the custom all over the earth. 32 Lets get our father to drink wine and then sleep with him and preserve our family line through our father.
KJV=
31 And the firstborn said unto the younger, Our father is old, and there is not a man on the earth to come in unto us after the manner of all the earth.
Thems wuz sum mighty ugly dotters!
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I don't read Hebrew, but I just looked at the Septuagint and the KJV is a pretty accurate rendition of the Greek text. The NIV looks like it is a looser translation at least in this case. The Greek phrase means "upon the earth."