TAYLOR, P.J.

The Huron County Prosecuting Attorney seeks leave to appeal a May 19, 1993, order of the Huron Circuit Court, which denied defendant's motion for a psychiatric examination of the victim but granted his motion to allow discovery of the prosecutor's file concerning the victim's father, who has been convicted of criminal sexual conduct involving his daughter in unrelated proceedings. The circuit court's order also allows discovery of the related probate court file, and allows defendant to introduce at trial evidence of the victim's prior sexual experience. In lieu of disposing of this application by order, MCR 7.205(D)(2), and because we believe our resolution of the issues presented will provide valuable guidance to the trial bench and bar concerning matters that frequently arise in criminal sexual conduct prosecutions, we have elected to decide the application by peremptory opinion. People v Nicolaides, 148 Mich. App. 100, 101; 383 N.W.2d 620 (1985); Manuel v Dep't of Corrections, 140 Mich. App. 356, 357; 364 N.W.2d 334 (1985).

Defendant is charged with a single count of first-degree criminal sexual conduct. The complainant, a seven-year-old girl, testified at preliminary examination that defendant inserted his tongue in her anus in mid-December 1992. Apparently, the victim was visiting defendant's seven-year-old sister, and had been invited to spend the night of December 11-12, 1992.

On November 30, 1992, the victim's father pleaded guilty of third-degree criminal sexual conduct involving his daughter. On January 4, 1993, the father was sentenced to three to fifteen years' imprisonment.

At a hearing regarding defendant's motion, defense counsel argued that he had no information concerning the particulars of the criminal sexual conduct the father allegedly perpetrated on his daughter. However, he claimed that he was privy to information suggesting that the victim had been having nightmares and sleep disturbances as a result of the sexual predations of her father, and accordingly he was contemplating a defense predicated on the contention that, while the victim would appear to be truthful and undoubtedly believes her allegations against defendant, the entire episode is a figment of her imagination.

Defense counsel argued to the court that, in order to prepare a defense, he needs access to the prosecutor's files relating both to child protective proceedings in probate court and to the criminal charges in circuit court involving the father. Counsel also urged that he needs to introduce evidence of the victim's prior sexual involvement with her father, first, to explain to the jury, in a manner not destructive of defendant's presumption of innocence, how a seven-year-old child could have intimate knowledge of sexual matters, and, second, in support of his "figment of the imagination" defense.

Although the prosecutor's statement of the issue focuses on the questions of discovery and admissibility, the argument portion of the prosecutor's brief effectively fails to address the question of discovery. We generally do not address the merits of unbriefed issues. People v Heard, 178 Mich. App. 692; 444 N.W.2d 542 (1989). In any event, in the civil as well as the criminal context, it is well established that inadmissible matters may be discoverable in aid of trial preparation. People v Baskin, 145 Mich. App. 526; 378 N.W.2d 535 (1985).

Because the ultimate admissibility of evidence in support of one of the defense theories would require the defendant to offer concrete evidence, People v Williams, 191 Mich. App. 269; 477 N.W.2d 877 (1991), the discovery order therefore seems appropriate with respect to the prosecutor's criminal file involving the victim's father — note that, had the father not pleaded guilty, the prosecutor would have had to present that information in a public trial — and because no separate argument is made concerning the discoverability of the probate court material, that portion of the trial court's order will be left undisturbed.

However, the trial court has prematurely ruled that evidence in support of the defense theory that might be obtained from the father's criminal and probate files will be admissible in this trial. First, information concerning the victim's past sexual experience is clearly inadmissible when offered to explain her familiarity with sexual matters in a manner not inculpatory of defendant. People v Arenda, 416 Mich. 1; 330 N.W.2d 814 (1982).

The "figment of the imagination" theory of the defense might just possibly be sufficiently intertwined with defendant's Sixth Amendment right of confrontation so as to overcome the exclusionary effect of the rape-shield statute, MCL 750.520j; MSA 28.788(10). However, a trial court considering such an issue, should always favor exclusion as long as exclusion does not abridge the defendant's right of confrontation. People v Zysk, 149 Mich. App. 452, 459; 386 N.W.2d 213 (1986), citing People v Hackett, 421 Mich. 338, 349; 365 N.W.2d 120 (1984).

The defendant is obligated initially to make an offer of proof regarding the proposed evidence and to demonstrate its relevance. Absent a sufficient showing of relevancy in the offer of proof, the motion for admission, whether presented at trial or in limine, must be denied. People v Hackett, supra at 350.

Even where the defendant surmounts that first hurdle, the next step is not admissibility at trial, but an in camera evidentiary hearing to determine the admissibility of the evidence in light of the constitutional inquiry. Id. Since Hackett, this Court has refused to even reach the merits of admissibility unless and until the trial court first conducts the requisite in camera hearing. People v Lucas (On Remand), 193 Mich. App. 298, 302; 484 N.W.2d 685 (1992). In this regard, it should be noted that the in camera hearing contemplated by Hackett is on the record, but outside the presence of the jury and the public, thereby facilitating the task of appellate review. Hackett, supra at 350. ("A hearing held outside the presence of the jury to determine admissibility promotes the state's interests in protecting the privacy rights of the alleged rape victim while at the same time safeguards the defendant's right to a fair trial. Furthermore, this procedure establishes a record of the evidence for appellate review of the trial court's ruling.")

Before remanding the Lucas case, supra, the Supreme Court of the United States recognized that, merely because a statute, such as the rape-shield statute, infringes a defendant's Sixth Amendment right of confrontation does not make it unconstitutional. The Sixth Amendment right of confrontation is subject to a balancing test involving other legitimate state interests in the criminal trial process, including avoiding, among other things, harassment, prejudice, confusion of the issues, safety of the witness, or interrogation that is repetitive or only marginally relevant. Michigan v Lucas, 500 US ___; 111 S Ct 1743; 114 L Ed 2d 205, 212 (1991).

At a minimum, defendant in this case would have to establish that the sexual conduct of which he is accused is highly similar to that charged against the victim's father. Defendant is charged with inserting his tongue in the victim's anus; if the father engaged only in relatively dissimilar sexual conduct, the evidence would be inadmissible as irrelevant, its prejudicial impact grossly exceeding its probative value. Zysk, supra at 459-460.

In Zysk, the defendant claimed that he and the complainant had previously engaged in consensual oral sex and bondage. However, Zysk was charged with first-degree criminal sexual conduct involving use of a weapon and vaginal and anal penetration. This Court held that evidence of such dissimilar prior sexual acts would not be relevant and was therefore barred by the rape-shield statute. The factual particulars of the charge against this defendant are sufficiently unique that it may eventuate that the defense notion of "transference" cannot be adequately tied to the prior sexual abuse of the victim to warrant its introduction into evidence.

Affirmed in part, reversed in part, and remanded for further proceedings consistent with this opinion. We retain no further jurisdiction.