Proverbs 30:18-20

18There are three that are beyond me and fourth that I do not know: 19the way of an eagle in the heavens; the way of a snake upon a rock; the way of a ship in the heart of the sea; and the way of a man with a young woman. 20Such is the way of the adulterous woman: She eats and wipes her mouth and says, " I have done no wrong."

The things in verse 19 are things that when happen there is no covering them up. Verse 20 says 'she eats and wipes her mouth and says, " I have done no wrong" ', which means that the adulterers wipe their mouths to show no sign of the feast that they have had. But God will always know what we have done as if we were a snake on the rock or a eagle in the heavens.