S.C. Code Ann. § 16-3-659

The common law rule that a boy under fourteen years is conclusively presumed to be incapable of committing the crime of rape shall not be enforced in this State. Provided, that any person under the age of 14 shall be tried as a juvenile for any violations of Sections 16-3-651 to 16-3-659.1. SECTION 16-3-659.1. Criminal sexual conduct; admissibility of evidence concerning victim's sexual conduct. (1) Evidence of specific instances of the victim's sexual conduct, opinion evidence of the victim's sexual conduct, and reputation evidence of the victim's sexual conduct is not admissible in prosecutions under Sections 16-3-615 and 16-3-652 to 16-3-656; however, evidence of the victim's sexual conduct with the defendant or evidence of specific instances of sexual activity with persons other than the defendant introduced to show source or origin of semen, pregnancy, or disease about which evidence has been introduced previously at trial is admissible if the judge finds that such evidence is relevant to a material fact and issue in the case and that its inflammatory or prejudicial nature does not outweigh its probative value. Evidence of specific instances of sexual activity which would constitute adultery and would be admissible under rules of evidence to impeach the credibility of the witness may not be excluded. (2) If the defendant proposes to offer evidence described in subsection (1), the defendant, prior to presenting his defense shall file a written motion and offer of proof. The court shall order an in-camera hearing to determine whether the proposed evidence is admissible under subsection (1). If new evidence is discovered during the presentation of the defense that may make the evidence described in subsection (1) admissible, the judge may order an in-camera hearing to determine whether the proposed evidence is admissible under subsection (1).