A 20-year-old can date a 16-year-old without breaking any law by itself. Going to dinner, seeing a movie, texting, and spending time together are legal in every state regardless of the age gap. The legal risk starts the moment the relationship involves sexual contact, explicit photos, alcohol, travel across state lines, or a parent who decides to intervene, and almost all of that risk falls on the older person.
Dating Is Legal Everywhere. Sex Is the Line.
No state criminalizes the act of dating someone younger. What states criminalize is sexual activity with a person below the age of consent, and a few related behaviors like supplying alcohol or harboring a runaway. If the relationship stays non-sexual and the minor’s parents are not actively opposing it, there is no criminal exposure from the age gap alone.
That distinction matters because most of the danger for the older partner comes from things that feel like normal parts of a relationship: a photo on a phone, a weekend trip, a night when the younger partner doesn’t want to go home. Each of those has its own set of rules that operate independently of whether the relationship itself is “allowed.”
Is Sex Legal? Check Your State’s Age of Consent
The age of consent is the minimum age at which a person can legally agree to sexual activity, and each state sets its own. Roughly two-thirds of states set it at 16, a smaller group uses 17, and about eleven states require a person to be 18.
In a state where the age of consent is 16, a sexual relationship between a 16-year-old and a 20-year-old is legal under state law. In a state where the age is 17 or 18, the same relationship is a crime, and it does not matter whether the younger person agreed to it or initiated it. Below the age of consent, the law treats the minor as legally incapable of giving meaningful agreement.
The state that matters is the state where the activity happens, not where the couple lives. A trip to a neighboring state with a higher age of consent puts the couple under that state’s rules while they are there.
Strict Liability: “I Didn’t Know” Is Not a Defense
Where sexual activity with a person under the age of consent is charged, the offense is usually called statutory rape, though many states use names like “sexual assault of a minor” or “unlawful sexual conduct.”1U.S. Department of Health and Human Services. Statutory Rape: A Guide to State Laws and Reporting Requirements In most states it is a strict liability offense, which means the older person’s beliefs about the minor’s age are legally irrelevant.2Legal Information Institute. Strict Liability
A 20-year-old cannot defeat a charge by showing the 16-year-old looked older, said they were 18, or produced a fake ID. Prosecutors do not have to prove the adult knew the minor’s real age. Penalties range from misdemeanors with small fines up to multi-year felony sentences depending on the state and the specific charges, and a felony sex offense conviction affects employment, housing, and civil rights long after any sentence is served.
Do Romeo and Juliet Laws Cover a Four-Year Gap?
Many states have close-in-age exemptions, often called Romeo and Juliet laws, that reduce or eliminate penalties when the two people are close in age. A gap of four years between a 16-year-old and a 20-year-old sits right at the outer edge of these protections.
Some states that allow up to a four-year difference would cover this couple. Others cap the exemption at three years or require the older person to still be a teenager. Arizona, for example, limits the defense to a gap of less than two years. Some states have no close-in-age exemption at all.
Even when an exemption applies, it usually works as a defense raised at trial rather than a shield against arrest. The 20-year-old can still be charged and put through the process before ever getting to argue it. The exemption also typically requires that the encounter was genuinely consensual and did not involve coercion or a position of authority over the minor. Anyone counting on one of these laws needs to read the exact statute in their state.
Photos and Texts: The Trap Most Couples Miss
Federal law defines a “minor” as anyone under 18 for purposes of sexually explicit images.3Office of the Law Revision Counsel. United States Code Title 18 – Section 2256 That definition applies in every state regardless of the age of consent. A 20-year-old in a state where sex with a 16-year-old is legal can still face federal felony charges for a sexually explicit photo the 16-year-old sent voluntarily.
The penalties are heavy. Receiving or distributing explicit images of a minor carries a five-year federal mandatory minimum and up to twenty years. Simple possession, with no forwarding, carries up to ten years.4Office of the Law Revision Counsel. United States Code Title 18 – Section 2252 Federal sentences are served in full; there is no parole.
In practice, this means a 20-year-old whose 16-year-old partner sends a nude photo over text has committed a federal crime by keeping it on their phone. Forwarding it, even back to the person who sent it, adds distribution charges. Some states have passed teen-specific sexting laws that soften penalties when both parties are minors. Those laws do not help an adult. The only safe rule for anyone over 18 dating anyone under 18 is to never request, receive, or keep a sexually explicit image.
Traveling Together Across State Lines
Federal law also criminalizes transporting anyone under 18 across state lines for the purpose of sexual activity. Under 18 U.S.C. ยง 2423, the offense carries a mandatory minimum of ten years and a maximum of life.5Office of the Law Revision Counsel. United States Code Title 18 – Section 2423 It applies whenever the sexual activity would violate any state or federal law.
For a couple that lives near a border or takes weekend trips together, this is a real risk. A 20-year-old who drives a 16-year-old into another state and has sexual contact during the trip has created federal jurisdiction over the case. The intent element only requires that the person knew they were transporting a minor and that sex was part of the purpose of the trip.
Alcohol, Runaway Situations, and Contributing to Delinquency
Even with no sexual contact at all, a 20-year-old dating a 16-year-old can be charged for behavior that pushes the minor into other legal trouble. Every state has some version of a contributing-to-the-delinquency-of-a-minor statute.
Common triggers include buying alcohol or tobacco for the minor, encouraging them to skip school, or letting them stay overnight after they’ve left home without their parents’ permission. That last one is the one that catches people: an adult who lets a 16-year-old crash at their apartment after a fight at home can face harboring charges on top of contributing-to-delinquency charges. These are usually misdemeanors carrying fines and up to a year in jail, though repeat offenses or aggravating facts can raise the stakes.
What a Parent Can Do
Parents and legal guardians have broad authority over who their minor child spends time with, and they do not need to prove a crime happened to use it. A parent who disapproves of the relationship can go straight to court and ask for a restraining order or order of protection on behalf of the minor.
Once that order is in place, any contact becomes a criminal matter for the 20-year-old. A phone call, a text, a wave in a parking lot, or showing up at the same party can result in arrest and criminal contempt charges. Judges rarely side with the adult who ignored the order. Because the restraining order route is straightforward, parents use it regularly even when the relationship has been entirely non-sexual.
Sex Offender Registration
A conviction for a sex offense involving a minor often triggers mandatory registration under the federal Sex Offender Registration and Notification Act. Registration under SORNA can last from fifteen years to life depending on the tier.6Office of Justice Programs. SORNA National Guidelines for Sex Offender Registration and Notification
The federal guidelines carve out a narrow exception for consensual conduct with a minor who is at least 13 when the offender is no more than four years older.6Office of Justice Programs. SORNA National Guidelines for Sex Offender Registration and Notification A 16-and-20 pairing falls inside that four-year window, so the federal exclusion may apply. States can and do impose their own registration rules that are stricter than the federal baseline, so whether registration is actually avoided depends on the state where the conviction happens.
Registration is life-altering in ways that outlast any sentence. Registrants face limits on where they can live and work, appear in public searchable databases, and have to report to law enforcement periodically for years or decades.