Incest

Remember the story of Lot which I quoted on April 29? Lot was the man who said, "Do not do this Wicked thing" instead, you may have my virgin daughters to gang rape as you like. Well, Lot was rewarded for his piety in stopping the men from raping the angels and offering his daughters instead, and he was allowed to escape his city before God destroyed every other man, woman, and child in it. As he left, his wife looked back, even though a man claiming to be an angel (how would Lot's wife know what to think at this point?) told them not to, and she was turned into a pillar of salt.

Later, Lot's daughters--likely suffering from Post-traumatic stress disorder--rape their father:

Genesis 34-38

On the following day, the firstborn said to the younger, “Behold, I lay last night with my father; let us make him drink wine tonight also; then you go in and lie with him, that we may preserve our family through our father.”

So they made their father drink wine that night also, and the younger arose and lay with him; and he did not know when she lay down or when she arose.

Thus both the daughters of Lot were with child by their father.

The firstborn bore a son, and called his name Moab; he is the father of the Moabites to this day. As for the younger, she also bore a son, and called his name Ben-ammi; he is the father of the sons of Ammon to this day.