Unlawful Sex
The adulterer shall marry none but an adulteress or an idolater; and the adulteress shall marry none but an adulterer or an idolater. This is forbidden to the believers.
24:3The adulterer shall not marry save an adulteress or an idolatress, and the adulteress none shall marry save an adulterer or an idolater. All that is forbidden unto believers.