South Dakota Codified Laws
Chapter 22A - Offenses Against The Family
Section 22-22A-3 - Aggravated incest_Related child--Felony.

22-22A-3. Aggravated incest--Related child--Felony.
Any person who knowingly engages in an act of sexual penetration with a person who is less than eighteen years of age and is either:
(1)The child of the perpetrator or the child of a spouse or former spouse of the perpetrator; or
(2)Related to the perpetrator within degrees of consanguinity within which marriages are, by the laws of this state, declared void pursuant to §25-1-6;
is guilty of aggravated incest. Aggravated incest is a Class 3 felony.

Source: SL 2005, ch 120, §21; SL 2008, ch 109, §1.