S.D. Codified Laws § 22-22-7.7
Subsequent conviction of rape of or sexual contact with a child under sixteen as felony
If an adult has a previous conviction for violation of subdivision 22-22-1(5), or a previous conviction for a felony violation of § 22-22-7 , or a previous misdemeanor conviction of § 22-22-7 for a violation committed as an adult, any subsequent conviction of subdivision 22-22-1(5) or § 22-22-7 , is a Class 2 felony.
Source: SL 2010, ch 115, § 2.