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

Section 3121. Rape

(a) Offense defined.--A person commits a felony of the first degree when he or she engages in sexual intercourse with a complainant:
1. By forcible compulsion.
2. By threat of forcible compulsion that would prevent resistance by a person of reasonable resolution.
3. Who is unconscious or where the person knows that the complainant is unaware that the sexual intercourse is occurring.
4. Where the person has substantially impaired the complainant's power to appraise or control his or her conduct by administering or employing, without the knowledge of the complainant, drugs, intoxicants or other means for the purpose of preventing resistance.
5. Who suffers from a mental disability which renders the complainant incapable of consent.
6. Who is less than 13 years of age.

(b) Additional penalties.--In addition to the penalty provided for by subsection (a), a person may be sentenced to an additional term not to exceed ten years' confinement and an additional amount not to exceed $100,000 where the person engages in sexual intercourse with a complainant and has substantially impaired the complainant's power to appraise or control his or her conduct by administering or employing, without the knowledge of the complainant, any substance for the purpose of preventing resistance through the inducement of euphoria, memory loss and any other effect of this substance.