Incest, C.R.S. 18-6-301
(1) Any person who knowingly marries, inflicts sexual penetration or sexual intrusion on, or subjects to sexual contact, as defined in section 18-3-401, an ancestor or descendant, including a natural child, child by adoption, or stepchild twenty-one years of age or older, a brother or sister of the whole or half blood, or an uncle, aunt, nephew, or niece of the whole blood commits incest, which is a class 4 felony. For the purpose of this section only, “descendant” includes a child by adoption and a stepchild, but only if the person is not legally married to the child by adoption or the stepchild.
(2) When a person is convicted of, pleads nolo contendere to, or receives a deferred sentence for a violation of the provisions of this section and the victim is a child who is under eighteen years of age and the court knows the person is a current or former employee of a school district or a charter school in this state or holds a license or authorization pursuant to the provisions of article 60.5 of title 22, C.R.S., the court shall report such fact to the department of education.