Statutory sexual assault is a criminal offense that occurs when an adult engages in sexual activity with a person below the legal age of consent, regardless of whether the younger person agreed. The age of consent runs from 16 to 18 depending on the state. Prosecutors do not have to prove force, threats, or trickery; the younger person’s age alone establishes the crime. A conviction is usually a felony and almost always triggers sex offender registration.
Pennsylvania uses the “statutory sexual assault” label in its code. Other states call the same conduct statutory rape, unlawful sexual intercourse with a minor, or sexual abuse of a minor. The underlying rule is the same across jurisdictions.
What the Prosecution Has to Prove
The offense has two elements: a sexual act, and a participant below the age of consent. Once those facts are established, the case is largely made. There is no inquiry into whether the minor initiated the encounter, said yes, or seemed enthusiastic. Judges instruct juries to disregard evidence that the minor was a willing participant, because the law does not recognize that willingness as valid consent.
This is what separates statutory offenses from other sexual assault charges. A standard sexual assault case turns on proving the encounter happened without consent, which often involves testimony about resistance, threats, or incapacitation. Statutory cases skip that entire inquiry. The theory behind the rule is that a person below a certain age lacks the maturity to understand the consequences of sexual activity, so any apparent agreement carries no legal weight.
Age of Consent by State
Every state sets its own threshold, which is why conduct that is legal in one place can be a serious felony in another. Roughly 32 states, including Ohio, Georgia, Michigan, and Pennsylvania, set the age of consent at 16. Eight states, including New York, Texas, and Illinois, set it at 17. The remaining states, including California, Florida, and Virginia, set it at 18.
The number is an absolute cutoff. Courts do not ask whether a particular minor was unusually mature or experienced. A 15-year-old who looks and acts 20 is still 15 under the law. Drawing the line at a fixed age removes the impossible task of assessing maturity case by case and gives everyone a clear rule.
Close-In-Age Exemptions
Many states recognize that charging an 18-year-old with a felony for sex with a 17-year-old partner produces an unjust result. Close-in-age exemptions, often called Romeo and Juliet laws, address this by either reducing the charge or eliminating criminal liability when both people are near each other in age.
The details vary. A typical structure allows a gap of two to four years before full penalties apply. Some states make the close-in-age situation a complete defense. Others reduce the offense from a felony to a misdemeanor, or exempt the person from sex offender registration while still treating the conduct as criminal. A few states apply the exemption only when the minor is above a minimum age, such as 14.
Federal law follows similar logic. Under 18 U.S.C. § 2243, the perpetrator must be at least four years older than the victim for the offense to apply, meaning a three-year age gap does not trigger a federal charge at all.1Office of the Law Revision Counsel. 18 USC 2243 – Sexual Abuse of a Minor, a Ward, or an Individual in Federal Custody
Is Believing the Minor Was Older a Defense?
It depends entirely on the state, and the split is dramatic.
Most states treat statutory rape as a strict liability crime with respect to age. In those jurisdictions, an honest and reasonable belief that the minor was old enough is no defense at all. Evidence about fake IDs, physical appearance, or lies the minor told about their age is irrelevant or inadmissible.
A minority of states allow a mistake-of-age defense. If the defendant can show their belief was genuine and reasonable, a jury can acquit on that basis. Federal law explicitly permits the defense: under 18 U.S.C. § 2243(d), a defendant can avoid conviction by proving, by a preponderance of the evidence, that they reasonably believed the minor had reached 16.1Office of the Law Revision Counsel. 18 USC 2243 – Sexual Abuse of a Minor, a Ward, or an Individual in Federal Custody The burden sits on the defendant to establish it; the government does not have to prove the defendant knew the victim’s age.
State Criminal Penalties
State penalties vary, but convictions are almost always felonies when the age gap is significant. The severity of the charge usually scales with two factors: how far apart the parties are in age, and how young the minor is. An encounter between a 19-year-old and a 15-year-old typically draws a less serious charge than the same conduct between a 35-year-old and a 13-year-old.
Many states use tiered classifications. A smaller gap might produce a lower-level felony with a sentence of a few years. A large gap or a very young victim can trigger the most serious felony classes, with sentences reaching 20 years or more. Prior sex offenses push sentences higher. Some states impose mandatory minimums for certain age combinations, removing judicial discretion.
When Federal Law Applies
Most statutory rape prosecutions happen in state court. Federal law reaches the offense only in specific settings. Under 18 U.S.C. § 2243, it is a federal crime to engage in a sexual act with someone at least 12 but under 16 when the perpetrator is at least four years older, and the conduct occurs within federal jurisdiction such as military bases, federal prisons, or Indian reservations.1Office of the Law Revision Counsel. 18 USC 2243 – Sexual Abuse of a Minor, a Ward, or an Individual in Federal Custody The maximum penalty is 15 years in prison, a fine, or both, with no mandatory minimum.
Sex Offender Registration
A statutory sexual assault conviction almost always carries a registration requirement. The federal Sex Offender Registration and Notification Act (SORNA) sets minimum standards that states must meet, though many go further.2Office of Sex Offender Sentencing, Monitoring, Apprehending, Registering, and Tracking. Current Law SORNA sorts offenders into three tiers that determine how long registration lasts:
- Tier I: 15 years, the default category. A clean record for 10 years can cut the period by 5 years.
- Tier II: 25 years.
- Tier III: lifetime registration, covering aggravated sexual abuse and sexual contact offenses against children under 13.
Which tier applies to a statutory rape conviction depends on how the state offense compares to the federal offenses listed in each tier definition.3Office of the Law Revision Counsel. 34 USC 20911 – Relevant Definitions, Including Amie Zyla Expansion of Sex Offender Definition and National Sex Offender Registry Registrants have to keep their address, employer, and school enrollment current in every jurisdiction where they live, work, or attend classes, and the information is publicly accessible through state registries.4eCFR. 28 CFR 72.5 – How Long Sex Offenders Must Register
Life After a Conviction
Registration is only the start. The collateral restrictions reshape daily life for decades.
Where You Can Live
Most states bar registered sex offenders from living within a specified distance of schools, daycare centers, parks, and playgrounds. The buffer zones usually run from 500 to 2,000 feet, and some jurisdictions extend them to 3,000 feet.5Office of Sex Offender Sentencing, Monitoring, Apprehending, Registering, and Tracking. Case Law Summary – Locally Enacted Sex Offender Requirements In dense urban areas, these zones can make it nearly impossible to find legal housing. Municipalities often layer their own restrictions on top of state law.
Work and Licensing
A felony sex offense disqualifies people from most jobs involving children, vulnerable adults, or positions of trust. Teaching, coaching, healthcare, counseling, and law enforcement are effectively closed. Many state licensing boards must revoke or deny professional licenses after a sex offense conviction, so even unrelated careers like architecture or accounting can be cut off. Military members face discharge, and federal employment largely disappears.
International Travel
International Megan’s Law requires the State Department to stamp the passports of certain registered sex offenders with an endorsement stating the bearer was convicted of a sex offense against a minor. Foreign immigration officials see the endorsement when they scan the passport, which often leads to denied entry or deportation.6Office of Sex Offender Sentencing, Monitoring, Apprehending, Registering, and Tracking. Statute in Review – International Megans Law Registrants also have to notify their jurisdiction at least 21 days before any international trip, with destination, flight, and lodging details. There is no emergency exception.
Sexting and Child Pornography Overlap
When a statutory sexual assault case involves explicit images, the exposure multiplies. Federal law defines child pornography as any visual depiction of sexually explicit conduct involving someone under 18, with no exemption for minors who create images of themselves.7Office of the Law Revision Counsel. 18 USC 2256 – Definitions for Chapter 110 An adult in a relationship with a minor can face statutory rape charges and separate federal child pornography charges, each carrying severe mandatory minimums. State close-in-age exemptions for the sexual conduct itself rarely extend to image-based offenses. Some states have passed specific sexting statutes that treat teen-to-teen exchanges as misdemeanors, but that reform is far from universal.
How These Cases Usually Come to Light
Every state designates certain professionals as mandatory reporters of suspected child sexual abuse. Teachers, administrators, doctors, nurses, counselors, coaches, daycare workers, and social workers all qualify in virtually every state. Some states extend the duty to all adults.
The trigger is reasonable suspicion, not certainty. A mandatory reporter who learns a 14-year-old is in a sexual relationship with a 20-year-old must report it, even if the student insists the relationship is consensual. Failing to report is itself a crime in most states, usually a misdemeanor. That is why statutory sexual assault cases often reach law enforcement through a school nurse, a pediatrician, or a counselor rather than through a complaint from the minor or the family.