S.D. Codified Laws § 22-22A-3 (2026)
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:
is guilty of aggravated incest. Aggravated incest is a Class 3 felony.
Source: SL 2005, ch 120 , § 21; SL 2008, ch 109 , § 1.