What the Seventh Commandment Is Really Protecting

Adultery is a sensitive subject, and it's one that has touched nearly everyone in some way. Researchers who study this vary widely in their estimates, but most land somewhere between 30 and 70 percent of marriages affected by adultery in some form. Even at the low end, that number means every act of adultery has ripple effects. It doesn't just wound a spouse. It touches children, extended family, and the wider community.

If you've been affected by this, directly or at a distance, it's normal for feelings to surface as you read this: hurt, anger, betrayal, shame. Our culture tends to bury those feelings and hide from them, because shame has a hiding instinct built into it. But burying something isn't the same as healing from it. Whatever comes up as you read, take it to God rather than pushing it back down. Ask him what he wants you to do with it.

Two Definitions, Held Together

The word "adultery" is never formally defined in Scripture, but our cultural definition lines up closely enough with the biblical one to use as a starting point. Specifically, adultery is having sex with someone else's spouse, or, if you're married, having sex with anyone other than your spouse. The Ten Commandments' prohibition covers both.

The Old Testament also gestures toward a broader category. Sexual sin generally, not just adultery in the narrow sense, falls under this same umbrella. One way to see this: two single people who have sex are not technically committing adultery. But statistically, one or both will likely marry someone else eventually, meaning they've had sex with someone else's future spouse. Every act of sexual sin ends up connected to this same command.

Jesus makes the broader definition explicit in Matthew 5:27-30:

"You have heard that it was said, 'You shall not commit adultery.' But I say to you that everyone who looks at a woman with lustful intent has already committed adultery with her in his heart. If your right eye causes you to sin, tear it out and throw it away, for it is better for you to lose one of your members than that your whole body be thrown into hell. And if your right hand causes you to sin, cut it off and throw it away, for it is better that you lose one of your members than that your whole body go into hell."

Jesus expands adultery to include lustful intent alone. The desiring, the ruminating, the wanting: these fall under the same command, even without a physical act. So two definitions need to be held together. One is specific: sex with someone else's spouse. The other is general: anything from a physical act up through lustful intent in the heart.

Worth noting: Jesus directs this teaching at men, which cuts against the ancient assumption (still echoed in parts of our culture) that adultery was primarily a women's issue, or that it only counted if the woman involved was married. Jesus closes that loophole. This is a heart issue, not a gender issue, and it's as present inside the church as outside it.

What Marriage Is Actually For

Every command has a corollary. The positive counterpart to "do not commit adultery" is "honor your marriage." To understand why God protects marriage this fiercely, it helps to go back to its origin in Genesis 2:20-25.

"The man gave names to all livestock and to the birds of the heavens and to every beast of the field. But for Adam there was not found a helper fit for him. So the LORD God caused a deep sleep to fall upon the man, and while he slept took one of his ribs and closed up its place with flesh. And the rib that the LORD God had taken from the man he made into a woman and brought her to the man. Then the man said, 'This at last is bone of my bones and flesh of my flesh; she shall be called Woman, because she was taken out of Man.' Therefore a man shall leave his father and his mother and hold fast to his wife, and they shall become one flesh. And the man and his wife were both naked and were not ashamed."

Three things stand out in this passage.

Marriage is the most important human relationship. The text says a man will leave his father and mother and hold fast to his wife. Before our first daughter was born, someone gave us advice I've come to think was badly mistaken: that I would love her more than I loved my wife, and that this new relationship would eclipse the marriage. Scripture says otherwise. The most important relationship any of us will have isn't with a parent, a child, or a close friend. It's with a spouse. Far better advice, which I received elsewhere, was that the best thing you can do for your children is love your spouse well.

Marriage exists for a purpose: to become one flesh. This includes sex, but it's not limited to it. Becoming one flesh is also about creating actual life. My wife and I created one flesh together, and she walks around today as our daughter. This is the language of procreation, and it connects to one of the first commands given to Adam and Eve: to be fruitful and multiply. Marriage is one of the primary vehicles God uses to fill the earth. And in the New Testament, that purpose extends further. A marriage where a husband loves his wife well and a wife responds in kind becomes something people are drawn to. Beautiful marriages point outward. They become one of the ways God still grows his kingdom and makes disciples, not through procreation alone now, but through the witness of a marriage lived well.

Marriage is meant to be a place of being fully known without shame. The text says Adam and Eve were naked and unashamed. This is physical, but it's not only physical. Shame has a hiding instinct, and we see that instinct kick in later in Genesis when sin enters the picture and the couple hides. But that wasn't the original design. In marriage as intended, even mistakes and imperfection don't require hiding. You can be spiritually and emotionally bare in front of your spouse and be fully known. That's likely why Scripture so often describes sex as "knowing" someone. Adultery, and the secrecy it requires, is the direct opposite of this. It replaces being known with hiding.

Pornography and the "Real Adultery" Question

Some treat pornography as a lesser issue than "real" adultery. It's worth reconsidering that assumption. Adultery, devastating as it is, typically involves two consenting adults. Pornography, by contrast, is fueled by an industry with alarmingly high rates of non-consent, including active ties to human trafficking. Even without direct payment, engagement with this content helps sustain one of the more exploitative industries in the world today. It's hard to call this the lesser sin.

Three Steps Forward

Whatever the specific situation, the path forward tends to follow the same three steps: repentance, forgiveness, and reconciliation.

Repentance means stopping and turning fully in the other direction, 180 degrees away from the sin and back toward honoring your marriage. This is rarely something to attempt alone. If pornography or infidelity is a present struggle, confession to your spouse (if married) and to same-gender accountability partners is essential, along with seeking outside help rather than trying to white-knuckle it privately.

Forgiveness works in multiple directions. Scripture describes sexual sin as a sin against your own body, which means part of this is forgiving yourself. Part of it is seeking forgiveness from a spouse, from God, and sometimes from a wider community.

Reconciliation means doing the slow work of rebuilding trust in the relationships that were damaged. This isn't quick. If the sin happened decades ago and was never confessed, the deception hasn't stayed in the past. It's continued every year since, which means there's no version of "it was so long ago, can't we move past it" that accounts for that continued pattern. Rebuilding trust after adultery, whether recent or decades old, takes real time no matter the timeline involved.

This also applies to situations that don't fit the narrow definition of adultery. Any sexual sin, wherever it falls, calls for the same posture: turn back toward marriage (or toward faithfulness, if unmarried), and seek forgiveness and reconciliation in the relationships affected.

If you're on the receiving end. Many carry the pain of someone else's adultery, whether a spouse's or a parent's, and struggle to forgive. That's an understandable and heavy weight. Jesus ties the way we forgive to the way God forgives us, and withholding forgiveness tends to wound the one withholding it more than anyone else. This isn't a call to pretend the hurt away. It's an invitation to keep working at forgiveness even while trust is still being rebuilt, which is its own long process.

If someone has confessed to you and asked you to help hold them accountable, a few things matter. Get resourced. There are good books and resources for these situations, and it's worth seeking them out rather than improvising. Be a good listener before offering advice. And go in understanding this is not a quick fix. Breaking these patterns and rebuilding trust often takes years, not days. Walking with someone through this is a long commitment, but it's also exactly what it looks like to be a community that holds one another accountable and lifts one another up.

God gave this commandment not to withhold something good from us, but to point us toward something even better: marriages marked by honor, faithfulness, and the kind of being fully known that reflects what marriage was always meant to be.