What Is Sexual Assault? Legal Definition, Penalties, and Consent

Sexual assault is any sexual act or sexual contact carried out without the other person’s valid consent. Federal law splits the conduct into two categories: a “sexual act,” which covers penetration and oral-genital contact, and “sexual contact,” which covers intentional touching of intimate body parts.¹ States use their own terminology — “criminal sexual conduct,” “sexual abuse,” “sexual battery” — but the elements are the same everywhere: a prohibited physical act, no valid consent, and criminal intent. Penalties scale sharply with the type of act, the circumstances, and the victim’s age or vulnerability.

Acts the Law Covers

Federal law divides prohibited conduct into two tiers, and the tier controls sentencing.

A “sexual act” means penetration (however slight) of the genitals or anus by a body part or object, as well as oral-genital and oral-anal contact.¹ Even minimal penetration meets the threshold. These are the heaviest-penalty offenses.

“Sexual contact” is the broader category: intentional touching of the genitals, anus, groin, breast, inner thigh, or buttocks, whether over or under clothing.¹ Groping, fondling, and forcing someone to touch the perpetrator all fall here. Contact through clothing counts; the law does not require skin-to-skin contact.

State definitions generally track these lines. Some states also reach non-contact behavior like forced exposure or voyeurism under their sexual offense statutes. The dividing line everywhere is the same: penetration offenses are treated as more severe than contact offenses.

When Consent Is Not Legally Valid

Consent means a freely given, voluntary agreement to a specific act at a specific time. Several circumstances strip any apparent agreement of legal weight.

Age

Every state sets a minimum age below which a person cannot legally consent to sexual activity. Most set it at 16; several set it at 17 or 18.² Sexual contact with someone below the age of consent is a crime even if the younger person appeared willing. Many states include “Romeo and Juliet” exceptions that reduce or eliminate penalties when both people are close in age.

Incapacitation

A person who is unconscious, asleep, or too impaired by drugs or alcohol to understand what is happening cannot consent. There is a gap in many state codes: as of recent reviews, roughly half of U.S. jurisdictions only treated a victim as legally incapacitated if the intoxication was involuntary, meaning they were drugged without their knowledge. Some states have since closed that loophole. People with severe cognitive impairments are also treated as unable to consent when they cannot understand the nature of the activity.

Coercion, Threats, and Fraud

Consent obtained through force, threats, or intimidation is void. The same applies to abuse of authority: a prison guard, therapist, or similar figure cannot claim valid consent from someone in their custody or care. A smaller area of law addresses consent obtained through deception. Federal military law, for instance, criminalizes sexual acts committed by pretending the act serves a professional purpose or by impersonating someone else.³ Some states include similar fraud provisions; coverage varies.

Affirmative Consent

A handful of states have written “affirmative consent” into their criminal codes, requiring active agreement expressed through words or actions rather than the mere absence of a “no.” California defines consent as “positive cooperation in act or attitude pursuant to the exercise of free will,” and Alaska requires “a freely given, reversible agreement specific to the conduct at issue.” Most states have not gone this far in their criminal statutes, though affirmative consent policies are common on college campuses. Everywhere, silence or lack of resistance is not consent.

What Prosecutors Have to Prove

A sexual assault conviction requires three elements. First, the defendant committed a specific physical act the law prohibits. Second, that act happened without the other person’s consent. Third, the defendant acted intentionally and with a sexual or abusive purpose. If any element is missing, the case fails.

Intent is what separates criminal behavior from incidental contact. Under federal law, “sexual contact” requires “an intent to abuse, humiliate, harass, degrade, or arouse or gratify the sexual desire of any person.”¹ A bump on a crowded subway is not a crime. Grabbing someone in the same spot deliberately is. Proving intent usually turns on witness testimony, the surrounding circumstances, and physical evidence.

The burden sits entirely with the prosecution, and the standard is proof beyond a reasonable doubt. Because much of what happens during a private encounter leaves no physical trace, these cases often come down to credibility.

Factors That Make Charges More Serious

Certain circumstances push a sexual assault from a baseline offense into a more severely punished category.

Use of a firearm, knife, or other dangerous object during the offense typically elevates the charge to the highest felony classification.
Serious physical injury — broken bones, internal injuries, or harm requiring emergency treatment — triggers enhanced penalties in most jurisdictions.
The victim’s age matters at both ends. Offenses against young children carry the steepest enhancements; under federal law, aggravated sexual abuse of a child under 12 doubles the maximum penalty for sexual contact offenses. Many states also enhance penalties when the victim is elderly, often defined as 60 or 65 and older.⁴
Offenses against people with physical or intellectual disabilities, or against pregnant individuals, trigger enhancements in numerous states.
A perpetrator who holds authority over the victim as caregiver, teacher, coach, or custodial figure faces enhanced charges because of the power imbalance itself.
Repeat offenders face dramatically steeper penalties. A second federal conviction for aggravated sexual abuse of a child carries a mandatory life sentence.⁵

Criminal Penalties

Penalties vary enormously depending on jurisdiction, severity of the act, and aggravating factors.

Federal

Aggravated sexual abuse — penetration accomplished through force, threats, or incapacitation — carries a potential sentence of any term of years up to life in prison. When the victim is a child under 12, the minimum jumps to 30 years, with life imprisonment for repeat offenders.⁵ Sexual abuse of a minor between 12 and 16, when the perpetrator is at least four years older, carries up to 15 years. The same 15-year maximum applies to sexual abuse of someone in official custody by a person with authority over them.⁶

For sexual contact offenses rather than sexual acts, the maximum depends on what the underlying circumstances would have supported had penetration occurred. Contact under circumstances that would qualify as aggravated sexual abuse carries up to 10 years. Contact under other coercive circumstances carries up to three years. Contact with a minor or ward carries up to two years.⁴

State

State sentences cover a wide spectrum. Felony convictions for penetration offenses commonly carry terms running from several years to life, depending on jurisdiction and circumstances. Lower-level sexual contact offenses may be classified as misdemeanors with sentences capped at one year. Fines accompany most convictions. Beyond incarceration and fines, a conviction creates a permanent record that affects housing, employment, and civil rights for life.

Military

Service members are prosecuted under Article 120 of the Uniform Code of Military Justice, which defines sexual assault and its penalties independently from civilian law.³ Military definitions of consent closely mirror the strongest civilian standards: lack of verbal or physical resistance is not consent, submission under force is not consent, and a prior relationship has no bearing on whether consent existed for a particular encounter. Military convictions carry imprisonment, dishonorable discharge, and forfeiture of pay and benefits.

Sex Offender Registration

The federal Sex Offender Registration and Notification Act (SORNA) requires anyone convicted of a qualifying sex offense to register with every jurisdiction where they live, work, or attend school. Registration is not optional. Obligations begin before the person finishes their prison sentence, or within three business days of sentencing if no prison time is imposed, and changes in name, address, employment, or school enrollment must be reported in person within three business days.⁷

SORNA sorts offenders into three tiers:

Tier I is a catch-all for sex offenses that don’t qualify for a higher tier. Registration lasts 15 years.⁸
Tier II covers offenses punishable by more than one year that involve minors, including trafficking, enticement, abusive contact with a minor, and child pornography production or distribution. Registration lasts 25 years.⁹
Tier III covers the most serious offenses, including aggravated sexual abuse, sexual abuse as defined under federal law, and abusive sexual contact with a child under 13. Registration lasts for life.⁹

SORNA also requires a DNA sample from every registered sex offender for inclusion in the FBI’s Combined DNA Index System.¹⁰ States may add requirements beyond the federal baseline, including residency restrictions barring registered individuals from living within a set distance of schools, parks, or childcare facilities. Those distances range from 500 feet to 2,500 feet or more, and roughly half the states enforce some version.

Restitution and Civil Lawsuits

Federal law requires judges to order financial restitution in every sexual offense conviction, with no exception for the defendant’s finances and no option to skip it because the victim has insurance. The order must cover the full amount of the victim’s losses, including medical, psychiatric, and psychological care; therapy and rehabilitation; lost wages; transportation, temporary housing, and childcare tied to the offense or the legal process; attorney costs and expenses for obtaining a civil protection order; and any other harm directly caused by the offense.¹¹ Restitution is separate from criminal fines and from damages a victim can pursue through a civil lawsuit. Many states have parallel provisions.

A victim can also sue the attacker in civil court, and in some cases institutions that enabled the abuse. Civil suits operate under a lower burden of proof, preponderance of the evidence rather than beyond a reasonable doubt, so they sometimes succeed where criminal prosecution does not. Economic damages cover measurable losses like medical bills and lost wages. Non-economic damages compensate for pain, suffering, and emotional trauma, and often represent the largest portion of a civil award. Courts may also impose punitive damages for particularly egregious conduct.

Time Limits for Prosecution

Time limits for prosecuting sexual assault vary dramatically by state, and the trend over the past decade has been to extend or eliminate them. At least 14 states have removed the criminal statute of limitations for certain sex offenses altogether.¹² Others maintain deadlines ranging from roughly 10 years to age-based cutoffs for childhood offenses.

For federal offenses against children, there is effectively no time limit: prosecution can proceed at any point during the victim’s lifetime, or within 10 years of the offense, whichever is longer.¹³ Most states also pause the clock under certain conditions, such as while the victim is still a minor, while the defendant is out of state, or while the victim is mentally incapacitated.¹²

One constitutional limit applies: once a criminal statute of limitations has fully run, reviving the prosecution by extending it retroactively violates the ban on ex post facto laws. Legislatures can lengthen deadlines that haven’t yet expired, and many have. Civil statutes of limitations are not subject to the same restriction, and several states have opened retroactive “lookback windows” allowing civil suits for older offenses.¹²

Rape Shield Protections

Federal Rule of Evidence 412 bars the introduction of a victim’s past sexual history in proceedings involving alleged sexual misconduct.¹⁴ The rule exists because defense attorneys historically used a victim’s prior sexual conduct to imply consent or attack credibility, a tactic that discouraged reporting. Every state has its own version. Narrow exceptions let the defense offer evidence of specific past sexual behavior with the accused, to argue consent, or with other persons, to show another source of physical evidence like injury or DNA. The underlying principle is simple: what someone did sexually in the past has almost no bearing on whether they consented to a specific act on a specific occasion.

Steps To Take After an Assault

If you or someone you know has been sexually assaulted, certain early steps preserve options for both criminal prosecution and civil recovery. None of these are required, and safety comes first.

Get to a safe location.
Preserve physical evidence if you can. Avoid showering, bathing, brushing your teeth, eating, or drinking before a medical exam. Save the clothing you were wearing in a paper bag, not plastic, which can destroy biological evidence. Keep text messages, emails, and social media posts related to the incident.
Seek a forensic medical exam. A Sexual Assault Forensic Exam, sometimes called a rape kit, collects DNA and other physical evidence. Evidence can often be collected several days after an assault, though sooner is better. The exam is typically provided at no cost.
Contact a crisis resource. The National Sexual Assault Hotline, operated by RAINN, is available 24/7 at 800-656-4673. Online chat is available at rainn.org, and text support is available by texting HOPE to 64673. Service members can reach the Department of Defense Safe Helpline at 877-995-5247.
Decide about reporting on your own timeline. Filing a police report is a personal choice, not a legal obligation. Having a forensic exam does not require you to file a report; evidence can be collected and stored while you decide. Many jurisdictions allow anonymous evidence collection.

Write down everything you remember as soon as you are able, including the names of anyone who may have seen you before or after the incident. Details fade quickly, and a written account made close to the event can matter later regardless of which legal path you take.

1
Office of the Law Revision Counsel. 18 USC 2246 – Definitions for Chapter 109A
2
U.S. Department of Health and Human Services. Statutory Rape – A Guide to State Laws and Reporting Requirements
3
Office of the Law Revision Counsel. 10 USC 920 – Art 120 Rape and Sexual Assault Generally
4
Office of the Law Revision Counsel. 18 USC 2244 – Abusive Sexual Contact
5
Office of the Law Revision Counsel. 18 USC 2241 – Aggravated Sexual Abuse
6
Office of the Law Revision Counsel. 18 USC 2243 – Sexual Abuse of a Minor or Ward
7
Office of the Law Revision Counsel. 34 USC 20913 – Registry Requirements for Sex Offenders
8
eCFR. 28 CFR Part 72 – Sex Offender Registration and Notification
9
Office of the Law Revision Counsel. 34 USC 20911 – Relevant Definitions Including Tiers of Sex Offenders
10
Office of Justice Programs. DNA Submission by SORNA Tribal Jurisdictions
11
Office of the Law Revision Counsel. 18 USC 2248 – Mandatory Restitution
12
FBI Law Enforcement Bulletin. Statutes of Limitation in Sexual Assault Cases
13
Office of the Law Revision Counsel. 18 USC 3283 – Offenses Against Children
14
Legal Information Institute. Federal Rule of Evidence 412 – Sex-Offense Cases The Victim