Permitted to you, on the night of the fasts, is the approach to your wives. They are your garments and ye are their garments. God knoweth what ye used to do secretly among yourselves; but He turned to you and forgave you; so now associate with them, and seek what God Hath ordained for you, and eat and drink, until the white thread of dawn appear to you distinct from its black thread; then complete your fast Till the night appears; but do not associate with your wives while ye are in retreat in the mosques. Those are Limits (set by) God: Approach not nigh thereto. Thus doth God make clear His Signs to men: that they may learn self-restraint. (2:187)

"Ye did not seek to hide yourselves, lest your hearing, your sight, and your skins should bear witness against you! But ye did think that God knew not many of the things that ye used to do! (41:22)