Preventative morality and guarding boundaries

وَلَا تَقْرَبُوا۟ ٱلزِّنَىٰٓ ۖ إِنَّهُۥ كَانَ فَـٰحِشَةً وَسَآءَ سَبِيلًا

And do not approach unlawful sexual intercourse. Indeed, it is ever an immorality and is evil as a way.