Either know who they are; or rather abuse them, as Lot's answer explains it, and so that word is used, Genesis 4:1 Numbers 31:17 Judges 19:22. And for the sin here committed, see Leviticus 18:22, Leviticus 20:13 Romans 1:26,27 1 Corinthians 6:9 Judges 1:7. They openly and impudently profess their wicked intention, for which they are branded, Isaiah 3:9; and this intention of theirs is the more probable, because of the great beauty which it is likely was in those bodies which the angels assumed, whereby their lust was more inflamed.
Related Commentaries of Genesis 19:5
Genesis 19:5
5 And they called unto Lot, and said unto him, Where are the men which came in to thee this night? bring them out unto us, that we may know them.