I'd say he was lucky, as long as he consented ;)
What Is Statutory Rape? How Is Statutory Rape Defined?
Statutory rape is a crime that involves sexual contact with a person who is under an age specified by law, commonly referred to as the "age of consent." Many states no longer refer to this crime as "statutory rape." The legal term for the crime varies by state. In some states, the offense falls under the state's general rape or sexual assault law. In others, it might be a separate crime, such as sexual intercourse with a minor, sexual assault or abuse of a child, or criminal sexual penetration of a minor.
Age of Consent
Statutory rape crimes reflect society's decision that children under a certain age can't consent to sexual contact or activity because they lack the maturity necessary to make a knowing choice about sexual activity. Based on this, the law might set the legal age of consent for sexual relations at say 15, 16, or 17. Unlike other sex crimes, consent by the underage partner is not a defense against statutory rape.
Strict Liability Crime
To be guilty of most crimes, a defendant must intentionally or knowingly commit a criminal act. But that's not the case with statutory rape and other strict liability crimes. The act of having sex with an underage person is a crime solely because of that person's age, regardless of whether the defendant knew the other person's age. In many states, the defendant can be convicted even if the underage person lied about their age.
http://www.criminaldefenselawyer.com/resources/criminal-defense/sex-crimes/statutory-rape-charges-punishment-defense
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