TL;DR: Lifestyle clauses are among the hardest prenup terms to enforce. Provisions penalizing weight, social-media posts, or infidelity are the shakiest, and many courts refuse to enforce them. In Diosdado v. Diosdado (2002), a California court voided a $50,000 infidelity penalty as against public policy. Enforceability turns on your state and how narrowly the clause is drafted, and it is never automatic.You read somewhere that lifestyle clauses "don't work," and now you want to know whether that is true before you spend time writing one into your agreement. Maybe you saw a headline about a weight clause or a social-media rule and wondered whether a court would ever back it up. The picture is more nuanced than a flat yes or no. Enforceability varies by state and by clause type, and some behavior provisions hold up better than others. Prenups are recognized in all 50 states and D.C., but only 29 states plus the District of Columbia have adopted the Uniform Premarital Agreement Act or its successor, which means where you sign shapes how a court reads what you signed.
That state-by-state reality is exactly why the answer to "can we put that in?" is rarely simple. Let's walk through what these clauses are, why courts tend to be skeptical of them, and what they can accomplish even when a judge would set them aside.
What a lifestyle or conduct clause actually is A lifestyle or conduct clause is a non-financial provision that tries to govern how a partner behaves during the marriage. Financial terms handle property, debt, and support. Conduct clauses handle everything else people sometimes want to control: a weight range, a rule about social-media posts, a penalty for cheating, expectations around household chores, or even intimacy frequency.
They come up more often than you might expect. Couples building their first prenup together sometimes want the document to reflect their shared values, and behavior feels like part of that. There is nothing wrong with wanting your agreement to say something about how you treat each other. The trouble starts when you expect a court to enforce it the way it would enforce a clause about who keeps the house.
If you are new to all of this, our prenup primer covers the basics, and our guide to what you can and cannot include in your prenup maps the general boundaries. This post zooms in on the conduct-based corner of that map, which is where the most confusion lives.
Why courts are skeptical of behavior clauses Three problems tend to sink conduct clauses, and they show up together.
The first is public policy. Most states use no-fault divorce, which means a court generally cannot weigh marital "fault" like infidelity when it divides property or awards support. A clause that imposes a penalty for cheating reintroduces fault through the back door, and many courts reject that. In Diosdado v. Diosdado, 97 Cal.App.4th 470 (2002), a California court held that a $50,000 penalty for infidelity was unenforceable because it violated the public policy underlying the state's no-fault divorce laws. The court would not let a contract do what the divorce statute forbids.
That reasoning is not limited to cheating. In In re Marriage of Mehren & Dargan, 118 Cal.App.4th 1167 (2004), a California court declined to enforce an agreement that transferred community property based on one spouse's drug use, again citing the state's no-fault policy. The lesson is that when a clause ties money to conduct, the no-fault framework often gets in the way, whatever the conduct is.
The second problem is proof. A behavior clause has to define the breach precisely enough that a court can decide whether it happened. What counts as a violation of a weight clause? Who measures, and when? Proving a breach is often difficult, invasive, and the kind of inquiry courts prefer to avoid.
The third problem is that some subjects belong to the person, not the contract. Weight and appearance provisions read as intrusive, and courts tend to treat them as contrary to public policy. There is a human cost here too. A clause that penalizes a partner for their body can set a tone that has nothing to do with the security a prenup is meant to provide. Most couples and attorneys steer away from weight provisions entirely, and for good reason. If you want to understand enforceability more broadly, our guide to what makes a prenup enforceable covers the fundamentals that apply to every clause.
Where these clauses stand by state and clause type Two things move the needle: your state, and how the clause is written.
State matters because conduct clauses do not get uniform treatment. In 2023, the Supreme Court of Maryland in Lloyd v. Niceta, 485 Md. 422 (2023), upheld an infidelity clause. It is worth being precise about what that case did and did not decide: the court addressed a postnuptial agreement, not a prenup, and limited its reasoning accordingly. Still, it shows that the enforceability of conduct clauses varies from one state to the next. A provision that a California court voids on public-policy grounds might survive elsewhere. Our overview of how prenuptial agreements vary across America walks through that variation in more detail.
Drafting matters because a narrow, specific clause has a better chance than a vague behavioral one. A social-media provision is a good example. A carefully written non-disparagement or privacy clause that protects a partner's income and reputation stands on firmer ground than a broad "be respectful online" term, because courts weigh free-speech interests against the contract and prefer language they can actually apply. Our piece on the prenup confidentiality clause goes deeper on how those provisions are structured. For infidelity clauses specifically, our guide to whether a prenup can have a cheating clause covers the California-versus-Maryland split in full.
Here is how the main categories tend to fare.
Clause type
How courts tend to treat it
Main reason
Financial terms (property, debt, separate property)
Generally enforceable
Core purpose of a prenup
Non-disparagement / social media (narrowly drafted)
Sometimes enforceable
Weighed against free-speech interest; easier to prove
Infidelity penalty
Often unenforceable in no-fault states
Reintroduces marital fault
Weight / appearance
Least likely to be enforced
Intrusive; public-policy concerns
Household chores / intimacy frequency
Rarely enforceable
Personal, not legal or economic
Child custody / support
Not enforceable
Decided by best-interests standard at the time
Notice the pattern. The closer a clause sits to money and property, the more likely a court will enforce it. The closer it sits to a person's private life, the shakier it gets.
The real risk: dragging down the rest of your prenup There is a downstream danger people miss. A shaky clause does not always fail quietly on its own. In some states, including an unenforceable lifestyle provision can invite a court to scrutinize the rest of your agreement more closely, and in the worst case set aside more of it.
Under California Family Code §1615 , for instance, a premarital agreement is unenforceable if it was not signed voluntarily or if it was unconscionable when signed. A conduct clause that looks coercive or one-sided can become part of a broader argument that the whole agreement was unfair, which is the opposite of what you want your prenup doing.
This is where a severability clause earns its place. A severability clause is a contract provision that lets a court remove one invalid term while keeping the rest of the agreement in force. If a judge strikes your social-media provision, good severability language helps the property and support terms survive intact. It helps, though it is not a guarantee. A court still has to be willing to sever, and a provision that taints the agreement's fairness can be harder to isolate.
The practical takeaway: every clause you add carries a small amount of risk to the whole. That is a strong reason to be deliberate about which conduct provisions, if any, are worth including.
What these clauses are actually good for So if a court might not enforce them, why do couples still bring them up? Because the conversation itself has value.
Talking through whether you want a social-media provision, or how you would each feel about an infidelity clause, surfaces expectations you might otherwise leave unspoken. That is a values conversation, and it is one of the quieter benefits of building a prenup together: you learn what matters to your partner before it becomes a source of friction. Creating the agreement can open honest communication about money, ambitions, and how you want to treat each other.
The financial terms are where a prenup does its work. In 2024, the U.S. recorded 2,390,482 marriages and 986,810 divorces, according to the CDC's National Center for Health Statistics . For the couples who do separate, the provisions that hold up are the clear ones about property, debt, and support, not the behavioral ones. If you want your agreement to protect something, put your energy into the terms courts are built to enforce, and treat the conduct discussion as a way to understand each other rather than a mechanism a judge will police.
Frequently Asked Questions Are lifestyle clauses in a prenup enforceable? It depends on your state and the clause. Provisions governing personal behavior, like weight, social media, or intimacy, are the hardest to enforce, and many courts decline to. Financial terms tend to hold up far better. A narrowly drafted, specific clause has a better chance than a vague behavioral one, but enforceability is never guaranteed.
Can you put a weight clause in a prenup? You can write one in, but it is among the least likely provisions to be enforced. Courts view appearance-based penalties as intrusive and often contrary to public policy. Including one may also weaken the rest of your agreement, so most couples and attorneys steer away from weight provisions entirely.
Is a social media clause in a prenup enforceable? Sometimes, if it is specific and reasonable. A narrowly written non-disparagement or privacy clause protecting income and reputation has a better chance than a vague "be respectful" term, because courts weigh free-speech interests against the contract. Enforceability varies by state and is decided case-by-case.
Why won't courts enforce infidelity or behavior clauses? In no-fault divorce states, courts generally cannot consider marital fault when dividing property or awarding support. A penalty for cheating reintroduces fault, which many courts reject on public-policy grounds. Behavior clauses also raise proof problems: defining and proving a breach is often difficult and invasive.
Can a bad clause invalidate my whole prenup? It can. In some states, including an unenforceable lifestyle clause risks the court scrutinizing or setting aside more of the agreement. A severability clause helps by letting a court remove one invalid provision while keeping the rest intact, but it is not a guarantee.
Building a prenup that holds up If a conduct clause matters to you, talk it through with your partner and, where it involves something like a postnuptial arrangement, consult independent legal counsel about a postnuptial agreement. But if the goal is an agreement that a court will back up, the strongest move is focusing on the clear, enforceable financial terms and getting the drafting right. First helps couples build exactly that kind of agreement online, on your timeline. When you are ready, you can start with First and see how the process works.
Enforceability of any conduct clause depends on your state and your circumstances, and the case outcomes described here are specific to their jurisdiction and facts. They do not predict how a court in another state would rule, and couples should consult independent counsel about their own situation.
Methodology These figures are drawn from the Uniform Law Commission's premarital-agreement enactment records (2026) and the CDC National Center for Health Statistics marriage and divorce data (2024), covering national U.S. counts and state adoption status. Case-law claims are drawn from the published appellate opinions cited by name, court, and year.
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