Age of Consent in Oregon: 3-Year Rule, Penalties, and Federal Charges

Oregon’s three-year rule on the age of consent is a legal defense, not a green light. Under ORS 163.345, a person charged with certain age-based sex offenses can raise the defense if they were less than three years older than the younger person at the time of the conduct, and if the only reason consent was legally missing is that the younger person was under 18. The conduct is still charged as a crime; the defense has to be raised and proven at trial, and it fails the moment anything other than age is in play.

How the Less-Than-Three-Years Math Actually Works

“Less than three years” means under 36 months, measured from birth date to birth date. A 17-year-old and a 15-year-old who are two years and eleven months apart fit. A pair three years and one day apart does not. Courts use actual dates of birth, not grade level or graduation year. Two people in the same class at school can easily fall outside the window depending on when their birthdays land.1Oregon State Legislature. Oregon Code 163.345 – Age as a Defense in Certain Cases

The statute also requires that the younger person’s lack of consent was due solely to being under the specified age. That word does a lot of work. If any other factor was involved in why consent was legally absent, the defense is gone.

Procedurally, this is a defense the accused raises. The prosecutor does not have to disprove it in the charging documents, and the state is not required to rule it out before filing charges. The person charged carries the burden of putting it forward and showing it fits.

Which Charges the Defense Covers

ORS 163.345 lists the specific offenses where the three-year defense is available. Anything not on the list is outside its reach.

For the broadest group, the defense applies with no minimum age for the younger person, as long as the age gap is under three years. That group includes third-degree rape, second-degree rape, third-degree sodomy, second-degree sodomy, third-degree sexual abuse, second-degree sexual abuse, first-degree sexual abuse, and contributing to the sexual delinquency of a minor.1Oregon State Legislature. Oregon Code 163.345 – Age as a Defense in Certain Cases

Second-degree unlawful sexual penetration is also on the list, but only when the penetration involved the actor’s hand or part of it.1Oregon State Legislature. Oregon Code 163.345 – Age as a Defense in Certain Cases

Sexual misconduct under ORS 163.445 is on the list with an extra condition: the younger person has to have been at least 15 at the time. Sexual misconduct covers intercourse or oral or anal sexual contact with an unmarried person under 18 and is a Class C misdemeanor.2Oregon State Legislature. Oregon Code 163.445 – Sexual Misconduct

Charges that are not on the list get no protection from this defense at all. First-degree rape, first-degree sodomy, and first-degree unlawful sexual penetration all sit outside ORS 163.345. Those charges typically involve very young victims or the use of force, and the three-year gap is legally irrelevant to them.

What Kills the Defense

The gap. A difference of three years or more, by even a day, ends the analysis. There is no rounding and no equitable stretch.

Force, threats, or coercion. Because consent has to be missing solely because of age, any physical force, threat, or psychological pressure knocks the defense out. At that point the age gap stops mattering.1Oregon State Legislature. Oregon Code 163.345 – Age as a Defense in Certain Cases

Incapacity beyond age. If the younger person was unconscious, intoxicated, or otherwise mentally incapacitated, the defense does not apply, because the incapacity gives the state a basis for lack of consent that has nothing to do with age.

Authority relationships. Oregon’s second-degree sexual abuse statute specifically targets coaches and teachers who are 21 or older and have sexual contact with someone they coached or taught.3Oregon State Legislature. Oregon Code 163.425 – Sexual Abuse in the Second Degree Second-degree sexual abuse is on the ORS 163.345 list in the abstract, but the coach or teacher provision creates a separate reason consent is legally absent, so the “solely due to age” requirement is not met.

Mistake about the other person’s age. Oregon’s sexual offense statutes generally do not include a good-faith mistake-of-age provision. Believing the other person was 18 does not, on its own, get you out of the charge if they were not.

Actual non-consent. Case law reinforces that the defense fails if the younger person did not in fact consent, even when the ages fit inside the three-year window. The rule protects against the age-based fiction of non-consent, not against real refusal.

What Happens if the Defense Doesn’t Apply

The stakes depend on which charge is on the table. The offenses most commonly at issue when the three-year rule is being discussed carry these consequences:

First-degree rape, which involves victims under 12 or the use of force, carries a Measure 11 mandatory minimum of 100 months with no possibility of early release or sentence reduction.8Oregon State Legislature. Oregon Legislative Committee Services – Measure 11 The three-year defense has no application there.

A conviction on any of these offenses triggers mandatory sex offender registration under ORS 163A, and the obligation lasts indefinitely until a court grants relief. Petitioning for relief is possible five years after supervision ends for lower-level offenses or ten years for more serious ones; juvenile offenders can petition after two years.9Oregon State Legislature. Oregon Revised Statutes Chapter 163A – Sex Offender Registration and Notification

Federal Charges Ignore the State Defense

The three-year rule is Oregon law only. It has no effect on federal charges. Under 18 U.S.C. § 2423(a), transporting a person under 18 across state lines with intent that they engage in sexual activity that violates any criminal law carries a federal mandatory minimum of 10 years. Federal law uses 18 as its threshold and does not recognize state close-in-age provisions.

Federal registration under SORNA adds a separate obligation. A qualifying conviction requires registration in every jurisdiction where the person lives, works, or attends school, and failing to register after crossing state lines can bring up to 10 years of federal imprisonment.10Legal Information Institute. Carr v. United States

A situation that fits neatly inside Oregon’s three-year defense on paper can still become a federal case if state lines are involved. Anyone counting on the defense should understand it protects against the Oregon charge, and only the Oregon charge.