Read Genesis 19:35 Using Other Translations
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.
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.
So that night they got him drunk with wine again, and the younger daughter went in and had intercourse with him. As before, he was unaware of her lying down or getting up again.