incest | Definition

Doc's CJ Glossary by Adam J. McKee
Course: Criminal Law

Incest in the criminal law context refers to a sexual relationship between individuals who are closely related, such as between siblings, half-siblings, parents and children, or other blood relatives.


The concept of incest comes from a societal taboo against intimate relationships between closely related individuals. In most cultures, the prohibition is on relationships between siblings, parents, and children, or other close blood relatives. However, it’s worth noting that definitions of what constitutes “closely related” can vary significantly from one society or legal jurisdiction to another.

Why Incest is a Crime

Incest is criminalized primarily due to the power dynamics often associated with it. It frequently involves the abuse of authority and the exploitation of more vulnerable family members, such as children or young adults. For example, a parent engaging in incestuous behavior with a child is not only committing a sexual offense but also abusing the inherent trust and power within the parental role.

Additionally, incest poses potential health risks. There is a higher chance of birth defects or genetic disorders among children born of incestuous relationships. This is due to the increased likelihood of both parents carrying the same recessive genes for certain conditions.

Legal Consequences of Incest

The penalties for incest differ from one jurisdiction to another. Depending on the region, legal punishment can be severe, including imprisonment or hefty fines. In some cases, those found guilty may be required to register as sex offenders, a designation that carries long-term social and legal consequences.

The Challenges in Prosecuting Incest Cases

Incest cases present unique difficulties for the legal system. Firstly, these cases often involve complex family dynamics that can make it challenging for victims to come forward. There may be significant fear or guilt associated with accusing a family member of such a serious crime.

Secondly, incest often occurs in private settings, meaning there are seldom any witnesses other than the victim and perpetrator. This lack of external evidence can make it difficult to prove an accusation beyond a reasonable doubt, a requirement for conviction in criminal cases.

Moreover, victims may face social stigma, shame, or fear of not being believed if they disclose incestuous abuse. These barriers can make it harder for victims to seek justice and for the legal system to effectively prosecute these cases.

Protecting Victims

Efforts to prevent incest and protect victims include social and educational programs that promote healthy family relationships, respect for personal boundaries, and a clear understanding of the consequences of incest.

Support services for victims, such as counseling and therapy, can also help victims recover from the trauma associated with incest and navigate the legal process if they choose to report the crime.

Model Penal Code

The Model Penal Code (MPC), a guideline developed to stimulate and assist U.S. state legislatures in updating and standardizing their criminal statutes, provides clear guidelines on the treatment of incest.

Under the MPC, incest is defined as “intercourse or deviate sexual intercourse with a person he [the actor] knows to be his ancestor, descendant, brother, or sister.” The terminology used makes it clear that the act doesn’t only apply to immediate family members but includes the extended family as well. This language is important because it clearly labels the crime and identifies who can be considered a victim or a perpetrator.

The MPC classifies incest as a felony of the third degree, which signifies that it’s considered a severe crime that warrants strong legal penalties. A felony of the third degree often carries significant imprisonment time and hefty fines. These penalties underscore the seriousness with which the law regards incest and its commitment to punishing such behavior.

However, the MPC also includes a special provision for incest cases involving victims under 12 years of age. In these instances, the crime is considered a felony of the first degree, indicating a higher level of severity and corresponding harsher punishment. This provision reflects a recognition of the additional vulnerability of young children and the extreme breach of trust such cases involve.

Importantly, the MPC mandates that in any incest prosecution, it doesn’t matter whether the sexual act was committed with consent. This is because incest is considered a crime of exploitation and abuse of power, where genuine consent cannot be obtained due to the inherent family power dynamics.

While the Model Penal Code offers a guide for states, actual laws and punishments vary significantly from state to state. However, the MPC’s treatment of incest can provide a useful framework for understanding how this crime might be handled in a legal context.

In conclusion, incest is a grave offense recognized and punished by criminal law due to its exploitative nature and potential harm to victims. Understanding its implications is crucial in ensuring the safeguarding of vulnerable individuals and maintaining healthy family dynamics.


[ Glossary ]

Last Modified: 05/22/2023

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