Pennsylvania Consolidated Statutes - Crimes and Offenses (Title 18) - Part II. Definition of Specific Offences.
Chapter 31- Sexual Offenses

Section 3122.1. Statutory sexual assault

Except as provided in section 3121 (relating to rape), a person commits a felony of the second degree when that person engages in sexual intercourse with a complainant under the age of 16 years and that person is four or more years older than the complainant and the complainant and the person are not married to each other.