What is the point of including the word adultery and not the others like fornication? Did God make a mistake or did Moses or did they jus run out of stone?
#1 God does not make mistakes.
#2 Although Moses would have needed a "10 man working party" to carry the tablets down from Sinai, there was plenty of stone.
#3 God does not play "Simon Says" or "Mother May I". He is neither a lawyer nor a politician playing word games. His 'yea' is 'yea' and His "nay' is 'nay'.
The "others like fornication" list would be lengthy and open to the same sort of parsing that the Serpent gave Eve in the Garden (He said to the woman, “Did God really say, ‘You can’t eat from any tree in the garden’?”)
"You shall not commit Adultery" is shorthand for, "Sex is reserved for your spouse, within marriage. Period."
Contrary to 'popular opinion', God is not "against Sex"; He is not a celestial 'wet blanket'. In the physical relationship between a man and a woman, He has given us a wonderful gift! There are many, many practical reasons He has restricted this to within marriage.
The bottom line is:
He loves us.
He has said, "No sex outside marriage".
We can trust Him.