Q. 70 Which is the seventh commandment? A. The seventh commandment is, Thou shalt not commit adultery. What is adultery? Technically, it is voluntary sexual relations between an individual who is married and someone who is not that individual's spouse. But as we have seen all along, the Ten Commandments are to be taken more broadly, including all sin that is associated with the sin that is expressly spoken of. From that perspective, adultery speaks of all sexual sins.