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  1. Home
  2. Crime of Adultery Explained by a attorney

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A curated collection of observations, industry developments, and firm perspectives on legal trends and business issues. These materials are provided for general informational and educational purposes only and are not legal advice. For guidance tailored to your specific situation, please contact our attorneys.

Crime of Adultery Explained by a attorney

Author : Donghoo Sohn, Esq.



The crime of adultery in New York occupies a unique space where historical criminal statutes meet modern matrimonial law. While the act is technically a criminal offense, it is most frequently cited as a ground for fault based divorce in civil court. This guide outlines the legal definitions, procedural hurdles, and financial implications for those navigating this complex issue. Understanding how the New York judicial system treats infidelity is essential for protecting your rights and preparing for the financial transition during a separation. By analyzing the intersection of penal codes and domestic relations law, individuals can make more informed decisions about their legal representation.

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1. crime of adultery New York: Statutory Classification


The crime of adultery is classified as a class B misdemeanor under New York Penal Law Section 255.17. The law defines this act as a person engaging in sexual intercourse with another individual while having a living spouse or knowing the other person has a living spouse. Although criminal prosecutions for this offense are extremely rare in the modern era, the statute remains active and serves as a formal declaration of the state's public policy regarding marital fidelity. This classification provides the legal basis for how the behavior is viewed in other judicial contexts, even if the penal consequences are seldom realized in a criminal courtroom. The persistence of this law underscores the state's historical interest in protecting the sanctity of the marital contract.



Legal Definition of the Act


To meet the threshold of the crime of adultery, there must be evidence of physical sexual intercourse. Emotional affairs or digital intimacy, while damaging to a marriage, do not satisfy the specific requirements of the penal code. Attorneys must distinguish between general misconduct and the narrow statutory definition when advising clients on potential litigation. This clarity ensures that legal claims are grounded in the actual requirements of the law and can withstand early challenges from opposing counsel. Accurate identification of the conduct is the first step in building a sustainable case for fault based relief.



2. Adultery Crime New York: Impact on Divorce


The primary impact of the adultery crime is felt within a Divorce action filed in the Supreme Court. While New York allows for no fault divorce, alleging the adultery crime can serve as a fault based ground for dissolution. This strategy is sometimes used by an aggrieved spouse to seek a formal judicial finding of misconduct, though it often leads to more contentious and public proceedings compared to no fault filings. Choosing this path requires a careful cost-benefit analysis of the emotional toll versus the potential legal clarity gained through a formal finding of fault.



Fault Based Grounds and Procedure


Under Domestic Relations Law Section 170, proving the adultery crime allows a spouse to obtain a divorce based on the other's voluntary sexual misconduct. This process requires the filing of a formal complaint and the presentation of specific evidence during the litigation. However, many practitioners advise using no fault grounds to streamline the process unless there is a strategic advantage to pursuing a fault based decree. The choice of grounds influences the emotional tone and the timeline of the entire case, potentially affecting how secondary issues like custody are perceived by the court during the early stages of the proceedings.



3. Crime of Adultery New York: Evidence Requirements


Proving the crime of adultery requires high quality Civil Litigation Evidence because New York law prohibits a spouse from testifying against the other to prove the act. This restriction, found in CPLR 4502, creates a significant procedural hurdle that necessitates the use of third party witnesses or forensic documentation. Meticulous preparation is required to build a case that can withstand judicial scrutiny in the Supreme Court without relying on the testimony of the parties themselves. This unique evidentiary rule places a high premium on objective data and independent verification.



Corroboration and Circumstantial Proof


Because direct evidence is rare, the court accepts circumstantial evidence demonstrating both inclination and opportunity. This involves proving that the parties had a mutual desire for intimacy and were alone in a private setting where such an act could occur. Testimony from private investigators, hotel records, or digital communications can be used to establish these facts. The following table summarizes the types of evidence often used in these proceedings:

Evidence TypeLegal Application
Third Party TestimonyProvides independent verification of the misconduct.
Forensic RecordsIncludes photos, emails, or GPS data showing opportunity.
Financial ReceiptsDocuments spending on gifts or travel for a paramour.


4. Adultery Crime New York: Economic Consequences


The financial impact of an adultery crime in New York is generally limited to the dissipation of marital assets. While the state follows equitable distribution rules, the court may adjust the award if marital funds were used to support an extramarital relationship. Protecting the marital estate from such waste is a primary objective for legal counsel during the discovery phase of the litigation. Financial accountability remains a key deterrent against the misuse of family resources during a period of marital instability.



Dissipation of Assets and Maintenance


If a spouse spent significant marital income on a third party, the judge may award the innocent spouse a larger share of the remaining assets as compensation for the loss. However, the adultery crime itself usually does not impact spousal maintenance unless the behavior was exceptionally egregious. Spouses should focus on documenting financial losses to ensure a fair distribution of the family wealth and a stable post-divorce outcome. This focus ensures that the economic consequences are addressed even if the emotional betrayal is not directly penalized by the court's award. Clear accounting of all expenditures is vital for achieving a truly equitable split of the estate.


03 Jul, 2025


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The information provided in this article is for general informational purposes only and does not constitute legal advice. Reading or relying on the contents of this article does not create an attorney-client relationship with our firm. For advice regarding your specific situation, please consult a qualified attorney licensed in your jurisdiction.
Certain informational content on this website may utilize technology-assisted drafting tools and is subject to attorney review.

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