Hebrews 13:4 Marriage is honorable among all, and the bed undefiled; but fornicators and adulterers God will judge.

Do I need to comment on this scripture?
It seems pretty straight forward.
The verse is not just about the institution of marriage but the intimacy associated with it.
The intimate relationship of marriage is sandwiched between the fornication of the non-married and the adultery of the married.
You know adultery has long been on the list of sins of capital punishment stemming from the Ten Commandments and the Torah.
Fornication is also indicated but not named as such in the OT except in a few of the prophetic books.
Nevertheless, sexual intimacy between the unmarried is not without judgment as is extra-marital.
Many people could care less about this verse, evident by the way their lifestyle.
Then again, God’s word often takes a back seat when personal sinful pleasure is involved.