S.D. Codified Laws § 43-3-4
Current with legislation signed by the governor on or before 3/6/2024
Conditions imposing restraints upon marriage, except upon the marriage of a minor, or of the spouse of the person by whom the condition is imposed, are void; but this does not affect limitations where the intent was not to forbid marriage, but only to give the use until marriage.
SDCL 43-3-4