Victims of Marital Deception in Japan Demand Criminal Penalties for Men Feigning Singlehood

Advocates in Japan lobby to criminalize 'dokushin giso,' where married men feign singlehood, arguing that sexual intimacy based on lies is a form of assault.

By: AXL Media

Published: Apr 2, 2026, 12:25 PM EDT

Source: Information for this report was sourced from The Japan Times

The Devastating Personal Cost of Marital Fraud

For many women in Japan, the discovery that a long term partner is actually married represents more than just a broken heart, it is a fundamental violation of their life trajectory. Mayu Yamamoto, a Tokyo resident, entered a two year relationship with a man who claimed to be divorced, eventually undergoing infertility treatment and becoming pregnant. It was only during her pregnancy that she discovered he was married with an infant of his own. This level of deception often involves elaborate fabrications, including meeting parents and purchasing engagement rings, leaving victims to navigate the complexities of unplanned single parenthood and the emotional wreckage of a stolen future.

Legal Limitations and the Concept of Sexual Autonomy

Under current Japanese law, deceiving a partner about marital status is primarily a civil matter rather than a criminal one, unless financial swindling is involved. Civil courts can order compensation if a plaintiff proves her "sexual autonomy" was unlawfully deprived, meaning she would not have consented to sex had she known the truth. However, the burden of proof is exceptionally high, requiring documented evidence that the woman explicitly stated she would not date a married man. Furthermore, victims who unknowingly engage with married men face the additional risk of being sued by the man's wife for joint liability in infidelity cases.

Insufficient Compensation and the Lack of Deterrence

Even when a victim successfully proves deception in court, the financial redress is often viewed as negligible. Typical compensation amounts hover around ¥1 million, a figure proponents of legal reform argue does not reflect the gravity of the trauma. Unlike the American legal system, which allows for punitive damages to discourage malicious conduct, Japanese law focuses on actual proven damages. In a landmark December ruling, a victim known as Maiko was awarded ¥1.5 million, a higher than average sum that has nonetheless fueled calls for a more robust legal framework to deter men from using dating apps to facilitate such fraud.