Mo. Rev. Stat. § 566.100: Sexual abuse in the first degree, penalties.

1. A person commits the offense of sexual abuse in the first degree if he or she subjects another person to sexual contact when that person is incapacitated, incapable of consent, or lacks the capacity to consent, or by the use of forcible compulsion.

2. The offense of sexual abuse in the first degree is a class C felony unless the victim is less than fourteen years of age, or it is an aggravated sexual offense, in which case it is a class B felony.