Plaintiff Michelle Triola (who used the name Michelle Marvin) and defendant Lee Marvin, a well-known actor, cohabited in California from approximately 1964 to 1970 without marrying. Michelle alleged that in consideration of her companionship, homemaking, and services as a partner in life, and in reliance on Lee's assurances, she gave up her own career as an entertainer at his request and devoted her efforts to their shared household and to furthering his career. She claimed the parties orally agreed to pool earnings, share equally in property acquired during the relationship, and that Lee would support her for life. After the relationship ended, Lee ceased financial support and excluded Michelle from property acquired during the cohabitation. Michelle sued asserting (1) breach of express contract, (2) breach of implied-in-fact contract, and (3) equitable claims including constructive trust, resulting trust, and quantum meruit. The trial court sustained a general demurrer and entered judgment for Lee on the ground that any agreement between the parties was unenforceable as contrary to public policy because it arose from a nonmarital, "meretricious" relationship. Michelle appealed.
Are agreements between unmarried cohabitants concerning support and property sharing enforceable, and may courts grant contract or equitable relief where the consideration is not inseparably based on sexual services?
Adults who voluntarily cohabit may lawfully contract with respect to property rights and support, and such contracts will be enforced unless expressly and inseparably founded on meretricious sexual services. Where no express agreement is shown, courts may examine the parties' conduct to determine whether an implied-in-fact contract exists; failing that, equitable remedies such as constructive trust, resulting trust, or quantum meruit may be available to prevent unjust enrichment. Cohabitation alone does not create property rights analogous to those arising from marriage, and courts will not impose community-property or alimony obligations absent marriage. If part of a bargain is unlawful (e.g., sexual services as consideration), lawful portions may be severed and enforced if they are independent and supported by separate consideration. See, e.g., California Civil Code §§ 1599, 1608.
Yes. Express agreements between nonmarital cohabitants are enforceable unless they rest on an express, inseparable exchange of sexual services for support; in the absence of an express contract, courts may recognize implied-in-fact agreements or grant equitable relief to allocate property or compensate services. The judgment sustaining the demurrer was reversed in part and the case was remanded for trial consistent with these principles.
The court rejected the categorical rule that all agreements between unmarried cohabitants are void as against public policy. Public policy favors the freedom of competent adults to order their economic affairs; denying enforcement merely because a relationship is nonmarital would penalize private living arrangements and defeat legitimate expectations. While the state has an interest in promoting marriage, that interest does not require courts to refuse to enforce lawful bargains simply because the parties cohabit. The court distinguished prohibited bargains trading sexual services for support from permissible agreements addressing pooling of earnings, property ownership, or support premised on lawful consideration such as household services, mutual efforts, or financial contributions. It emphasized severability: even if an agreement references sexual relations, courts may enforce independent, lawful promises if they are not inseparably tied to sexual consideration (Civ. Code § 1599). Thus, a complaint should not be dismissed at the pleading stage simply because the parties were intimate partners; the trier of fact must determine the nature of consideration and whether a contract exists. Turning to remedies, the court held that traditional contract doctrines apply. An express contract, if proved, is enforceable. In the absence of an express agreement, the parties' conduct may evidence an implied-in-fact contract to share property or provide support. Moreover, equity may intervene—through constructive or resulting trusts or restitution (quantum meruit)—to prevent unjust enrichment when one partner contributes labor or assets to the other's accumulation of wealth. At the same time, the court refused to create quasi-marital property rights by judicial fiat: cohabitation alone does not generate community-property or alimony obligations. The proper inquiry is contractual and equitable, not a wholesale importation of marital regimes into nonmarital relationships. Because the trial court dismissed at the pleading stage based on an overbroad public-policy rationale, the Supreme Court reversed in part and remanded for factual development to determine whether any enforceable contract or equitable basis for relief existed and whether any unlawful (sexual) consideration could be severed from otherwise lawful promises.
Marvin fundamentally reframed disputes between unmarried cohabitants as contract and equity cases rather than purely family-law matters. It coined the analytical template for "palimony" claims: prove an enforceable express or implied bargain or, failing that, obtain restitutionary or trust remedies to prevent unjust enrichment. It also set the outer limits—no automatic marital-style property rights and no enforcement of sex-for-support bargains. For law students, Marvin is a canonical case on public policy and contracts, the enforceability of intimate-partner agreements, implied-in-fact contracts, severability, and equitable remedies.
Marvin v. Marvin established that courts should analyze disputes between unmarried cohabitants through the lens of ordinary contract and equity doctrines, not through blanket prohibitions or automatic marital analogies. Express agreements are enforceable unless they hinge on sexual consideration; implied-in-fact contracts and equitable remedies may fill gaps to prevent unjust enrichment.