While there is technically nothing stopping couples from including a cheating clause in a prenup, there is a chance that California courts won’t uphold them. This is because California is a no-fault divorce state.
So, what does this mean?
Essentially, a no-fault divorce doctrine means that the judge can’t use the reason for the divorce to determine how assets are divided. In other words, acts like adultery or infidelity aren’t considered in the divorce process. Instead, the grounds for divorce are usually a result of irreconcilable differences.
Basically, if you decide to get a divorce because your partner breaks the infidelity clause in your prenup, the court may not enforce the stipulations in that clause. This includes any restitution or asset divisions. In fact, if the cheating clause is seen as egregious, it might even invalidate the entire prenup. Let’s discuss why this can happen and how California treats an infidelity clause in a prenup.
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Why Couples Want Cheating Clauses in the First Place
The request for a cheating clause almost always comes from the same place: one partner wants some kind of accountability built into the marriage. If I give up my financial independence, build a life with you, and you walk away for someone else shouldn’t there be a consequence?
That instinct is completely understandable. The problem is that California’s legal system has already decided, definitively, that marriage is not a contract where one party’s misconduct determines the financial outcome. The state made that decision in 1969, when California became the first state in the country to adopt no-fault divorce eliminating fault entirely from the divorce process. Since then, courts have consistently refused to let private contracts between spouses reintroduce the fault concept that the legislature explicitly removed.
Understanding why the law works this way makes the limitation easier to accept and makes it easier to find protections that actually hold up.
What Is a Prenup Cheating Clause?
A prenup cheating clause, also known as an infidelity clause in a prenup, is a provision that imposes financial consequences if one spouse is unfaithful during the marriage. While these clauses might seem like a way to encourage honesty or protect against betrayal, they fall under a category known as lifestyle clauses. These are non-financial terms that attempt to regulate personal behavior during the marriage, such as how often a couple is intimate or how household chores are divided.
In California, lifestyle clauses, including an infidelity clause in a prenup, are generally not enforceable. Courts do not want to be in the business of monitoring or enforcing personal conduct within a marriage, and any provision that crosses into that territory is likely to be disregarded. Including such clauses can also distract from the financial seriousness of the agreement and, in some cases, raise questions about its overall validity.
Other unenforceable lifestyle clauses to avoid in a California prenuptial agreement include:
- Weight or appearance requirements,
- Frequency of intimacy,
- Household chore assignments,
- Agreements about when to have children,
- Restrictions on in-law relationships, and
- Vacation planning or travel conditions.
If you’re drafting a prenuptial agreement in California, it’s best to stick to provisions that courts will actually enforce like asset division, debt allocation, business interests, and spousal support. A skilled prenuptial agreement attorney can help ensure your agreement reflects your goals while complying with state law.
How No-Fault Divorce Affects the Enforcement of a Cheating Clause in a Prenup
The enforceability of a cheating or infidelity clause in a prenuptial agreement is complex. These clauses, often referred to as “lifestyle clauses,” usually impose financial penalties on a spouse who commits adultery or some otherwise unaccepted behavior. Since this directly goes against the idea of a no-fault divorce, courts in California heavily scrutinize any lifestyle clause in a prenup.
For example, in order for a prenup to be enforceable in California, the terms must be “fair” and “reasonable.” It’s possible that a judge may view an infidelity clause in a prenup as unreasonable because it goes against the idea of a no-fault divorce. As such, they may disregard the clause during divorce proceedings. At worst, they may void the prenup altogether just because it has a cheating clause.
Related: What Clauses Are Most Important to Include in My Prenup?
The main reason for this is because California Family Code § 2335 states that evidence of infidelity or other misconduct during the marriage is inadmissible in most circumstances. This was actually cited in the 2002 case Diosdado v. Diosdado. In this case, the plaintiff and the defendant had a cheating clause in a prenup that ordered the cheating spouse to pay $50,000 in damages to the other. However, the Court of Appeals threw out the entire agreement because it was contrary to California’s no-fault divorce laws. This set a precedent that makes it nearly impossible to enforce any type of lifestyle clause in a California prenup.
California No-Fault Divorce: How It Started and Why It Matters Here
California was the first U.S. state to fully eliminate fault-based divorce, passing the Family Law Act in 1969 under Governor Ronald Reagan. Before that, a spouse seeking divorce in California had to prove grounds adultery, cruelty, abandonment and the conduct of each spouse was directly relevant to the outcome.
No-fault divorce removed all of that. Under California law today, either spouse can file for divorce simply by stating that the marriage has suffered irreconcilable differences. No proof of wrongdoing is required, no evidence of conduct is considered, and no judge is permitted to penalize one spouse financially because of their behavior during the marriage.
Cal. Fam. Code § 2335 codifies this directly: evidence of specific acts of misconduct during the marriage is inadmissible in dissolution proceedings. Infidelity, cruelty, abandonment none of it enters the courtroom in a California divorce.
A cheating clause in a prenup tries to do exactly what the legislature said courts cannot do: impose financial consequences for marital misconduct. That direct conflict with public policy is why these clauses don’t survive California courts.
Does Cheating Void a Prenup in Califor?
While having a cheating clause in a prenup can void it, cheating doesn’t necessarily void a prenup. In other words, if you have a prenup that doesn’t have a cheating clause and your spouse has an affair, your prenup may still be valid in California. However, to be sure that you have a valid prenup, we recommend working with an experienced prenup attorney.
Does Cheating Affect Divorce Settlement in California?
No. Due to court precedent and California’s no-fault divorce doctrine, cheating does not usually affect the division of property in a divorce. This means that it’s important to focus on creating a prenup that is fair and reasonable so that it remains valid in any divorce proceeding.
What to Include Instead: Clauses That Address the Same Underlying Concerns
While an infidelity clause in a prenup isn’t enforceable in California, there are plenWhat to Include Instead: Clauses That Address the Same Underlying Concerns
When couples ask for a cheating clause, the underlying concern is usually one of three things: fear of being left financially vulnerable after investing in a marriage, worry about losing assets they built independently, or concern about being entitled to nothing if the marriage ends badly. All three of those concerns are legitimate and all three can be addressed through provisions that California courts will actually enforce.
Spousal Support Provisions
If the concern is financial vulnerability after a long marriage, a structured spousal support clause gives more real protection than an infidelity penalty ever could. A prenup can establish support amounts tied to the length of the marriage, cap or extend the duration of payments, or set conditions that reflect the financial dynamics of the relationship. Courts scrutinize these provisions carefully, but when properly executed with independent counsel for the waiving party, they hold up.
Property Division Clauses
If the concern is protecting assets built before or during the marriage, a clear property division clause does that work. Income, investments, business value, real estate appreciation all of it can be designated as separate property, regardless of how the marriage ends or why.
Sunset Provisions
If the concern is that a long marriage deserves different treatment than a short one, a sunset provision can reflect that. Terms that shift or expire after a certain number of years acknowledge that a 20-year marriage is economically different from a 2-year one.
Business Protection Clauses
If a business owner is the one asking for a cheating clause, what they may really need is protection ensuring their business can’t be forced into a 50/50 split at divorce. A business interest clause accomplishes that directly, without the enforceability risk.
None of these provisions carries the legal risk of a cheating clause. Each one addresses the financial reality the couple is actually trying to protect. That’s the conversation worth having what outcome are you trying to prevent, and what clause actually prevents it?
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Are Any Lifestyle Clauses Enforceable in California?
While infidelity clauses aren’t enforceable in California, what about other lifestyle clauses, such as whether or not a couple chooses to have kids or rules around religious practices? Usually, other lifestyle clauses are often not upheld in California courts because it’s a no-fault state. California Family Code § 2335 states that “evidence of specific acts of misconduct is improper and inadmissible.” Just like a cheating clause, other lifestyle clauses will be heavily scrutinized in court.
Do Cheating Clauses Work in Other States?
California’s no-fault framework is not universal. The enforceability of infidelity clauses depends entirely on which state governs the marriage — which is one reason choice-of-law provisions matter in prenuptial agreements.
In fault-based divorce states — including Texas, Pennsylvania, Tennessee, and New York — marital misconduct can be relevant to the division of assets or spousal support. In those states, infidelity clauses may be enforceable if they’re clearly written, voluntary, and not unconscionable at the time of enforcement.
In no-fault states — California, Nevada, Iowa, Hawaii, and others — financial penalties for adultery are contrary to public policy and generally unenforceable.
If a couple includes a choice-of-law provision specifying that another state’s law governs their prenup, does that change the analysis in California? Generally, no. California courts have been reluctant to apply another state’s law in ways that would conflict with fundamental California public policy — and eliminating fault from divorce is considered a fundamental policy choice. A California court would most likely still refuse to enforce a cheating clause even if the prenup nominally applies Texas law.
Frequently Asked Questions
Can a cheating clause void an entire California prenup?
Yes, this is one of the more serious risks of including a cheating clause in a California prenup. In Diosdado v. Diosdado, the Court of Appeal did not just decline to enforce the infidelity penalty it threw out the offending provision entirely on public policy grounds. While that ruling struck the clause rather than the whole agreement, courts retain the authority to void an entire prenup if they find its terms are sufficiently contrary to public policy. An egregious cheating clause particularly one with large penalties or that suggests the agreement was drafted in bad faith can create grounds to challenge the entire document. The risk is real.
Does cheating affect spousal support in California?
In most circumstances, no. Under Cal. Fam. Code § 2335, evidence of specific acts of marital misconduct is inadmissible in divorce proceedings. A judge considering spousal support in California is not permitted to increase or reduce support because one spouse was unfaithful. Support is determined based on financial factors: the length of the marriage, each spouse’s earning capacity, the standard of living during the marriage, and each spouse’s financial needs and obligations. Conduct during the marriage is not part of that calculation.
If I can’t have a cheating clause, how do I protect myself financially if my spouse cheats?
The honest answer is that California’s legal system does not provide a financial remedy specifically for infidelity. What a well-drafted prenup can do is ensure that your financial position is clearly protected regardless of why the marriage ends through property division clauses, spousal support provisions, and business protection terms that don’t depend on proving anyone did anything wrong. Those protections work in every scenario, not just infidelity, and unlike a cheating clause, they will be enforced.
Are cheating clauses enforceable anywhere in the United States?
Yes, in some states. Fault-based divorce states including Texas, Pennsylvania, Tennessee, and New York may enforce infidelity clauses if they are clearly written, mutually agreed upon, and not unconscionable. Enforcement still varies by court and by how the clause is structured, but the legal framework does not categorically prohibit them the way California’s does. If you are based in California or your marriage is primarily based here, California law will almost certainly govern and enforcement will not follow.
Secure Your Future—Talk to a Prenup Attorney in California Today
Navigating the nuances of prenuptial agreements in California can be confusing. At Cyrus Pacific Law, we know the ins and outs of making a prenup that addresses all of your needs. We’re dedicated to ensuring your prenup aligns with your goals, providing peace of mind for both you and your partner. Let us help you build a strong foundation for your marriage. Reach out to Cyrus Pacific Law today for a free prenup consultation.