Sex by mistake in the Bible

Lot and his daughters

And Lot went up out of Zoar, and dwelt in the mountain, and his two daughters with him; for he feared to dwell in Zoar: and he dwelt in a cave, he and his two daughters.

And the firstborn said unto the younger, Our father is old, and there is not a man in the earth to come in unto us after the manner of all the earth:

Come, let us make our father drink wine, and we will lie with him, that we may preserve seed of our father.

And they made their father drink wine that night: and the firstborn went in, and lay with her father; and he perceived not when she lay down, nor when she arose.

And it came to pass on the morrow, that the firstborn said unto the younger, Behold, I lay yesternight with my father: let us make him drink wine this night also; and go thou in, and lie with him, that we may preserve seed of our father.

And they made their father drink wine that night also: and the younger arose, and lay with him; and he perceived not when she lay down, nor when she arose.

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

And the first born bare a son, and called his name Moab: the same is the father of the Moabites unto this day.

And the younger, she also bare a son, and called his name Benammi: the same is the father of the children of Ammon unto this day. Genesis 19:30-38

Jacob and Leah

And Jacob served seven years for Rachel; and they seemed unto him but a few days, for the love he had to her.

And Jacob said unto Laban, Give me my wife, for my days are fulfilled, that I may go in unto her.

And Laban gathered together all the men of the place, and made a feast.

And it came to pass in the evening, that he took Leah his daughter, and brought her to him; and he went in unto her. ...

And it came to pass, that in the morning, behold, it was Leah. Genesis 29:20-25

Judah and his daughter-in-law

And it was told Tamar, saying, Behold thy father in law goeth up to Timnath to shear his sheep.

And she put her widow's garments off from her, and covered her with a vail, and wrapped herself, and sat in an open place, which is by the way to Timnath; for she saw that Shelah was grown, and she was not given unto him to wife.

When Judah saw her, he thought her to be an harlot; because she had covered her face.

And he turned unto her by the way, and said, Go to, I pray thee, let me come in unto thee; (for he knew not that she was his daughter in law.) And she said, What wilt thou give me, that thou mayest come in unto me?

And he said, I will send thee a kid from the flock. And she said, Wilt thou give me a pledge, till thou send it?

And he said, What pledge shall I give thee? And she said, Thy signet, and thy bracelets, and thy staff that is in thine hand. And he gave it her, and came in unto her, and she conceived by him. Genesis 38:13-18