Cal. Lab. Code § 3208.4
In any proceeding under this division involving an injury arising out of alleged conduct that constitutes sexual harassment, sexual assault, or sexual battery, any party seeking discovery concerning sexual conduct of the applicant with any person other than the defendant, whether consensual or nonconsensual or prior or subsequent to the alleged act complained of, shall establish specific facts showing good cause for that discovery on a noticed motion to the appeals board. The motion shall not be made or considered at an ex parte hearing.
The procedures set forth in Section 783 of the Evidence Code shall be followed if evidence of sexual conduct of the applicant is offered to attack his or her credibility. Opinion evidence, evidence of reputation, and evidence of specific instances of sexual conduct of the applicant with any person other than the defendant, or any of such evidence, is not admissible by the defendant to prove consent by or the absence of injury to the applicant, unless the injury alleged by the applicant is in the nature of loss of consortium.
Ca. Lab. Code § 3208.4