True. And each time it was a sin. For that matter the Bible is not even from Christianity. It was put together as a collection under Roman rule and is an official government document. We have lost most of the original Christian gospels when the Bible was made. Only books that fit with Roman sensibilities and law were allowed. These official books have also changed greatly from their original iterations.
Take for example the Sumerian story of Gilgamesh. God destroyed the world in a flood, one guy made an ark and filled it with animals to repopulate the planet. Sound familiar? It's the story that Noah and the ark is derived from. In other cases widely read Christian books were banned. The "Gospel according to Mary" was one such book. The Romans were completely against the idea of a women's role in religion. There must be priests and the priests must be men. It's the Roman way! They can't have a book in the Bible with lines like "But if the Savior made her worthy, who are you indeed to reject her? Surely the Savior knows her very well."    

P.S. If Lot can screw his daughters to increase the population then I should be able to repopulate the Earth with my sister. (This would be creepier if I had a sister  )