California Code, Evidence Code - EVID § 783

(a) A written motion shall be made by the defendant to the court and the plaintiff's attorney stating that the defense has an offer of proof of the relevancy of evidence of the sexual conduct of the plaintiff proposed to be presented.

(b) The written motion shall be accompanied by an affidavit in which the offer of proof shall be stated.

(c) If the court finds that the offer of proof is sufficient, the court shall order a hearing out of the presence of the jury, if any, and at the hearing allow the questioning of the plaintiff regarding the offer of proof made by the defendant.

(d) At the conclusion of the hearing, if the court finds that evidence proposed to be offered by the defendant regarding the sexual conduct of the plaintiff is relevant pursuant to Section 780, and is not inadmissible pursuant to Section 352, the court may make an order stating what evidence may be introduced by the defendant, and the nature of the questions to be permitted. The defendant may then offer evidence pursuant to the order of the court.