Missouri Revised Statutes Title XXXVIII. Crimes and Punishment; Peace Officers and Public Defenders § 566.030. Rape in the first degree, penalties--suspended sentences not granted, when

1. A person commits the offense of rape in the first degree if he or she has sexual intercourse with another person who is incapacitated, incapable of consent, or lacks the capacity to consent, or by the use of forcible compulsion. Forcible compulsion includes the use of a substance administered without a victim's knowledge or consent which renders the victim physically or mentally impaired so as to be incapable of making an informed consent to sexual intercourse.

2. The offense of rape in the first degree or an attempt to commit rape in the first degree is a felony for which the authorized term of imprisonment is life imprisonment or a term of years not less than five years, unless:

3. Subsection 4 of section 558.019 shall not apply to the sentence of a person who has been found guilty of rape in the first degree or attempt to commit rape in the first degree when the victim is less than twelve years of age, and “life imprisonment” shall mean imprisonment for the duration of a person's natural life for the purposes of this section.

4. No person found guilty of rape in the first degree or an attempt to commit rape in the first degree shall be granted a suspended imposition of sentence or suspended execution of sentence.