Adultery Laws in Oregon (2026): No Crime, But Still Complicated

Most people assume cheating on a spouse is illegal. In Oregon, it’s not. Adultery is not a crime here. But that doesn’t mean it has zero consequences.

If your marriage is falling apart because of infidelity, you need to understand how Oregon’s laws actually work. The legal reality might surprise you.

What Is Adultery?

Adultery means a married person having a sexual relationship with someone who is not their spouse. It’s one of the oldest legal concepts in American law. But states have handled it very differently over the years.

Some states still treat adultery as a criminal offense. Oregon is not one of them. Oregon removed adultery from its list of crimes a long time ago. Today, it’s basically a personal matter, not a legal one.

Is Adultery Illegal in Oregon?

Nope. Not even a little bit.

Adultery is not a crime in Oregon. You cannot be arrested for it. You cannot be charged or prosecuted. There is no fine and no jail time. This has been the law for years now.

Wondering if this applies to you? Yes, it does. Whether you’re the one who cheated or the one who was cheated on, Oregon law treats adultery as a private matter between spouses.

Oregon Is a No-Fault Divorce State

Here’s where things get really important. Oregon does not allow fault-based divorces at all.

That means no one has to prove anyone did anything wrong to get a divorce. The only thing Oregon requires is “irreconcilable differences.” That’s the legal term for saying the marriage is broken and can’t be fixed.

Pretty straightforward, right?

Under Oregon law (ORS 107.025), one spouse simply says the marriage is over. The court accepts that. No proof of cheating, cruelty, or abandonment is needed. Oregon abolished fault-based divorce grounds under ORS 107.036 back in 1971. It was one of the first states in the country to do this.

Can You Use Adultery as Grounds for Divorce?

No. You cannot.

Oregon courts will not accept adultery as a reason for granting a divorce. The only ground for divorce in Oregon is irreconcilable differences. Full stop.

Some people expect to walk into court and “prove” their spouse cheated. Oregon law does not work that way. The judge doesn’t want to hear about the affair. The law doesn’t care who caused the marriage to fail.

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Honestly, this surprises a lot of people. They think adultery gives them some kind of legal advantage. In Oregon, it doesn’t work that way.

How Adultery Can Still Affect Your Divorce

Okay, pause. Read this carefully.

Even though adultery isn’t a crime and can’t be used as grounds for divorce, it can still come up in your divorce case. There are a few specific situations where it matters.

Money Spent on the Affair

This is the big one. If your spouse used marital money to fund the affair, that’s called financial misconduct. We’re talking about spending shared funds on gifts, trips, hotels, or other expenses for a romantic partner.

Courts in Oregon look at how marital assets were spent. If large amounts of money went toward an affair, a judge can take that into account during property division. You might receive a larger share of the remaining assets to make up for what was spent.

Think of it like this: the affair itself doesn’t matter legally, but the money trail does.

Property Division

Oregon is an equitable distribution state. That means property is divided fairly, but not always 50/50. Courts look at many factors to decide what’s fair.

Under ORS 107.105, Oregon courts cannot consider fault when dividing property. Cheating alone will not get your spouse a smaller share of the assets. But financial misconduct tied to the affair is a different story. If money was hidden, transferred, or wasted on an affair, that can shift the division in your favor.

Spousal Support

Oregon courts decide spousal support (also called alimony) based on financial need. Not on who cheated.

The fact that your spouse had an affair does not automatically disqualify them from receiving support. It also doesn’t guarantee you more support if you were cheated on. Financial need and earning capacity are what matter most.

That said, there’s an exception. If the affair caused you emotional harm so severe that it hurt your ability to work or earn income, a judge might consider that. It’s a narrow situation, but it exists.

Wait, it gets more interesting. If your spouse spent tens of thousands of shared dollars on an affair, a court might award you compensatory alimony. That’s a way of making up for the financial damage caused by the affair.

Child Custody

Oregon courts always put children first. Custody decisions are based entirely on the child’s best interests.

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A parent’s affair does not automatically hurt their custody case. Courts are not there to punish parents for their personal conduct.

But there is a limit to that. If the affair created an unstable home environment for the kids, that matters. If a new partner has been introduced too quickly and it’s affecting the children negatively, a judge will pay attention to that. Adultery affects custody only when it directly harms the children.

What Oregon Courts Will and Won’t Consider

Most people get this wrong, so let’s clear it up.

A judge in Oregon will NOT consider how the affair made you feel emotionally. They will NOT punish your spouse just for cheating. The moral side of infidelity is not the court’s concern.

A judge WILL consider whether shared money was spent on the affair. They WILL look at whether a new partner is affecting your children. They WILL take financial misconduct seriously.

That’s the real line. Personal conduct? Not relevant. Financial conduct? Very relevant.

Special Circumstances to Know About

A friend asked me about this recently. She thought that because her husband had an affair, she’d automatically win everything in the divorce. That’s not how it works in Oregon. She was surprised.

Here are a few specific situations worth knowing about.

If you and your spouse have a prenuptial agreement, the terms of that agreement may affect how property is divided. Some prenups include infidelity clauses. If yours does, those terms may be enforceable in Oregon.

If your spouse is in the military, the divorce process follows mostly the same rules. The no-fault standard still applies. Adultery in the military can have separate consequences under the Uniform Code of Military Justice, but that’s a federal matter, not a state one.

If you are going through a legal separation rather than a full divorce, the same no-fault rules apply. Adultery will not affect whether a separation is granted.

How to Protect Yourself Legally

So what should you actually do if adultery is part of your situation?

First, document any financial misconduct. Keep records of unusual spending. Bank statements, credit card records, and receipts can all be useful. If your spouse spent marital money on an affair, that evidence matters.

Second, don’t rush into introducing a new partner to your children. Even though you have the right to date during separation, doing it too fast can hurt your custody case.

Third, talk to a family law attorney in Oregon before making big decisions. Oregon’s laws are specific, and every case is different. An attorney can help you understand how the details of your situation apply.

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You’re not alone in finding this confusing. Most people going through infidelity-related divorces don’t realize how strict the no-fault rules are. Getting real legal advice early makes a big difference.

Frequently Asked Questions

Is adultery a crime in Oregon?

No. Adultery is not a crime in Oregon and has not been illegal for many years. You cannot be arrested, charged, or fined for it.

Can I use adultery as grounds for my divorce in Oregon?

No. Oregon only allows no-fault divorces under ORS 107.025. The only accepted ground is irreconcilable differences.

Will my cheating spouse lose their share of property?

Not automatically. Adultery alone does not affect property division. But if marital money was spent on the affair, a judge can adjust the property split to account for that.

Does cheating affect spousal support in Oregon?

Generally no. Spousal support is based on financial need, not on who cheated. However, extreme financial misconduct tied to the affair can sometimes influence the outcome.

Can an affair affect child custody in Oregon?

Only if it directly harms the children. Courts focus entirely on the child’s best interests. A parent’s affair is not a factor unless it created instability or harm for the kids.

What if my spouse spent our savings on their affair?

That counts as financial misconduct. You can present that evidence in court during property division. A judge may award you a larger share to compensate for the loss.

Final Thoughts

Here’s the bottom line on adultery laws in Oregon. Cheating is not a crime. It’s not grounds for divorce. And in most cases, it won’t dramatically change your divorce outcome.

But the financial side of an affair can matter. And the impact on your children can matter too. Those are the areas where adultery still carries real legal weight in Oregon.

Stay informed, talk to a qualified Oregon family law attorney for your specific situation, and don’t assume the law will automatically take your side just because you were the one who was cheated on.

Now you know how it actually works.