[jimt]

Their used to be anti adultary laws.

Actually there's a very good non-biblical justification for anti-adultery laws.

Marriage (besides its sacramental nature) is a contract. Breaking the terms of a contract, especially while engaging in fraud and deceit, is criminal. Assisting someone else to break a contract, while practicing fraud and deceit, is criminal.

A criminal law regarding adultery is quite defensible from a secular viewpoint.

[weegee]

A criminal law regarding adultery is quite defensible from a secular viewpoint.

I agree on the same grounds you identified.

[biblewonk]

Good differentiation between secular and biblical reasoning.

This would also apply to same sex marriage but there is certainly no secular reason not to allow same sex marriage.

[republicofdavis]

"Breaking the terms of a contract, especially while engaging in fraud and deceit, is criminal."

Your statement seems to imply that there are times that breaking a contract without fraud and deceit could be criminal. Doubtful.

In any event, I doubt that criminal prosecution of adultery is an idea that's really going to get off the ground in America. Let's leave that to the sandy countries.