OPINION
BRYNER, Chief Judge.
Ronald Williamson was charged by indictment with one count of murder in the second degree, one count of robbery in the first degree and two counts of tampering with physical evidence. AS 11.41.110(a)(1); AS 11.41.500(a)(1); AS 11.56.610(a)(1), (a)(4). Following a jury trial, Williamson was convicted of manslaughter, a lesser-included offense of second-degree murder. He was also convicted of both counts of tampering with physical evidence. Superi- or Court Judge J. Justin Ripley sentenced Williamson to five years’ imprisonment for each of the tampering charges and fifteen years’ imprisonment for manslaughter. Williamson appeals, contending that the trial court erred in admitting the hearsay statement of his codefendant, Otis Orth, which was offered to prove that Williamson intended to rob the decedent, John Dunkin. In addition, Williamson argues that the court erred in excluding evidence which supported his claim that he was acting in self-defense, including evidence of Dun-kin’s sexually aggressive behavior on a pri- or occasion and physical evidence that Dun-kin had access to drugs. Because we cannot find that admission of Orth’s hearsay statement was harmless beyond a reasonable doubt, we reverse Williamson’s conviction for manslaughter and remand for a new trial.
FACTS
On the night of October 31, 1981, Ronald Williamson shot and killed John Dunkin. The facts surrounding the shooting were disputed at Williamson’s trial. The state alleged that Williamson was attempting to [968]*968rob the decedent and that Williamson killed Dunkin when he resisted. The defense proceeded on the theory that Williamson was defending himself against a homosexual rape.
The state presented evidence that Williamson went out on Halloween night of 1981 with his friend, Otis Orth. They eventually arrived at the Hallea Lodge in Wasil-la, where they met John Dunkin. According to the state’s theory, Williamson saw that Dunkin was friendly and apparently a man of means; when Dunkin invited Williamson to go barhopping, Williamson decided to rob Dunkin and accepted the invitation.
According to the state, Dunkin and Williamson left the Hallea Lodge in Dunkin’s car and went for a drive. Williamson eventually convinced Dunkin to stop the car and attempted to rob him. When Dunkin resisted, Williamson shot him. Williamson then put Dunkin’s body in the trunk and drove back into town to find Orth. Orth and Williamson then drove to a remote area and mutilated the body almost beyond recognition. They also hid Dunkin’s car and his valuables in separate locations.
The defense presented a different account of the events. Williamson testified that he and Orth went out on Halloween night but that neither one of them was carrying a weapon. At the Lodge, Dunkin approached Williamson and began buying him drinks. According to Williamson, Dun-kin engaged him in conversation for a while and then asked Williamson and Orth if they wanted to “do some Quaaludes.” Williamson and Orth agreed, and the three of them went outside to Dunkin’s car. Before they could drive away, however, the bartender came outside and indicated to Orth that he did not think it was a good idea for Orth and Williamson to leave with Dunkin. The three then returned to the bar.
Later in the evening, according to the defense, Dunkin again offered Williamson some Quaaludes. This time Williamson left the bar alone with Dunkin and went for a ride in Dunkin’s car. Williamson testified that Dunkin gave him two or three Quaaludes while they were driving around. At one point Williamson dropped his cigarette lighter. When he reached under the passenger seat to retrieve-it, he felt a gun.
Williamson testified that he and Dunkin eventually reached a remote area where Dunkin stopped the car. Dunkin then asked Williamson what his sexual preference was. Williamson noticed that Dun-kin’s pants were open and his penis was exposed. According to Williamson, Dunkin grabbed him and attempted to force him to perform fellatio. During the ensuing struggle, Dunkin forced Williamson onto his stomach and attempted to remove Williamson’s pants. Williamson reached under the passenger seat, grabbed the gun he had discovered earlier, and shot Dunkin once in the chest.
Williamson admitted that he and Orth later attempted to destroy Dunkin’s body.
Approximately one week later, Williamson voluntarily appeared at the Anchorage police station to turn himself in. He confessed and led investigators to Dun-kin’s body. Williamson’s confession was largely consistent with his testimony at trial.1
[969]*969HEARSAY
The state’s last witness, Patricia Lynn Boyles, testified that she was present at Huppies Roadhouse in Wasilla on- Halloween night of 1981. She saw Orth there at about 1:30 a.m. According to Boyles, when Orth was asked where his friend Williamson was, Orth replied, “He went out to roll a queer [who] had a lot of money.”
Williamson objected to Boyles’ testimony on hearsay grounds but the trial court admitted it under the co-conspirator’s exception to the hearsay rule. Alaska Rule of Evidence 801(d)(2)(E).2 Williamson contends on appeal that admission of the statement allegedly made by Orth was reversible error. He argues that the statement was not made in furtherance of any conspiracy.
The state concedes error, noting that the Alaska Supreme Court has recently reaffirmed the vitality of the “in furtherance of” requirement. See Crump v. State, 625 P.2d 857, 863 (Alaska 1981). See also Morris v. State, 630 P.2d 13, 17 (Alaska 1981). After an independent review of the record, we have decided to accept the state’s confession of error. See Marks v. State, 496 P.2d 66, 67-68 (Alaska 1972). Even assuming that the existence of a conspiracy between Williamson and Orth had been independently established by a preponderance of the evidence, see Hawley v. State, 614 P.2d 1349, 1355 (Alaska 1980); Amidon v. State, 565 P.2d 1248, 1259 (Alaska 1977), it is difficult to conceive how Orth could be found to be advancing the purpose of the joint undertaking by casually divulging it to witnesses. Crump v. State, 625 P.2d 857, 863 (Alaska 1981). The statement attributed to Orth by Boyles, that Williamson left the bar “to roll a queer,” can accurately be “described as a ‘casual admission of culpability to someone [Orth] had individually decided to trust.’ ” Crump, 625 P.2d at 863 (quoting United States v. Moore, 522 F.2d 1068, 1077 (9th Cir.1975), cert. denied, 423 U.S. 1049, 96 .S.Ct. 775, 46 L.Ed.2d 637 (1976)). We therefore hold that it was error to admit Orth’s statement through Boyles’ testimony.
The state contends, and, in his dissent, Judge Singleton agrees, that the admission of Orth’s out-of-court statement was harmless error.
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OPINION
BRYNER, Chief Judge.
Ronald Williamson was charged by indictment with one count of murder in the second degree, one count of robbery in the first degree and two counts of tampering with physical evidence. AS 11.41.110(a)(1); AS 11.41.500(a)(1); AS 11.56.610(a)(1), (a)(4). Following a jury trial, Williamson was convicted of manslaughter, a lesser-included offense of second-degree murder. He was also convicted of both counts of tampering with physical evidence. Superi- or Court Judge J. Justin Ripley sentenced Williamson to five years’ imprisonment for each of the tampering charges and fifteen years’ imprisonment for manslaughter. Williamson appeals, contending that the trial court erred in admitting the hearsay statement of his codefendant, Otis Orth, which was offered to prove that Williamson intended to rob the decedent, John Dunkin. In addition, Williamson argues that the court erred in excluding evidence which supported his claim that he was acting in self-defense, including evidence of Dun-kin’s sexually aggressive behavior on a pri- or occasion and physical evidence that Dun-kin had access to drugs. Because we cannot find that admission of Orth’s hearsay statement was harmless beyond a reasonable doubt, we reverse Williamson’s conviction for manslaughter and remand for a new trial.
FACTS
On the night of October 31, 1981, Ronald Williamson shot and killed John Dunkin. The facts surrounding the shooting were disputed at Williamson’s trial. The state alleged that Williamson was attempting to [968]*968rob the decedent and that Williamson killed Dunkin when he resisted. The defense proceeded on the theory that Williamson was defending himself against a homosexual rape.
The state presented evidence that Williamson went out on Halloween night of 1981 with his friend, Otis Orth. They eventually arrived at the Hallea Lodge in Wasil-la, where they met John Dunkin. According to the state’s theory, Williamson saw that Dunkin was friendly and apparently a man of means; when Dunkin invited Williamson to go barhopping, Williamson decided to rob Dunkin and accepted the invitation.
According to the state, Dunkin and Williamson left the Hallea Lodge in Dunkin’s car and went for a drive. Williamson eventually convinced Dunkin to stop the car and attempted to rob him. When Dunkin resisted, Williamson shot him. Williamson then put Dunkin’s body in the trunk and drove back into town to find Orth. Orth and Williamson then drove to a remote area and mutilated the body almost beyond recognition. They also hid Dunkin’s car and his valuables in separate locations.
The defense presented a different account of the events. Williamson testified that he and Orth went out on Halloween night but that neither one of them was carrying a weapon. At the Lodge, Dunkin approached Williamson and began buying him drinks. According to Williamson, Dun-kin engaged him in conversation for a while and then asked Williamson and Orth if they wanted to “do some Quaaludes.” Williamson and Orth agreed, and the three of them went outside to Dunkin’s car. Before they could drive away, however, the bartender came outside and indicated to Orth that he did not think it was a good idea for Orth and Williamson to leave with Dunkin. The three then returned to the bar.
Later in the evening, according to the defense, Dunkin again offered Williamson some Quaaludes. This time Williamson left the bar alone with Dunkin and went for a ride in Dunkin’s car. Williamson testified that Dunkin gave him two or three Quaaludes while they were driving around. At one point Williamson dropped his cigarette lighter. When he reached under the passenger seat to retrieve-it, he felt a gun.
Williamson testified that he and Dunkin eventually reached a remote area where Dunkin stopped the car. Dunkin then asked Williamson what his sexual preference was. Williamson noticed that Dun-kin’s pants were open and his penis was exposed. According to Williamson, Dunkin grabbed him and attempted to force him to perform fellatio. During the ensuing struggle, Dunkin forced Williamson onto his stomach and attempted to remove Williamson’s pants. Williamson reached under the passenger seat, grabbed the gun he had discovered earlier, and shot Dunkin once in the chest.
Williamson admitted that he and Orth later attempted to destroy Dunkin’s body.
Approximately one week later, Williamson voluntarily appeared at the Anchorage police station to turn himself in. He confessed and led investigators to Dun-kin’s body. Williamson’s confession was largely consistent with his testimony at trial.1
[969]*969HEARSAY
The state’s last witness, Patricia Lynn Boyles, testified that she was present at Huppies Roadhouse in Wasilla on- Halloween night of 1981. She saw Orth there at about 1:30 a.m. According to Boyles, when Orth was asked where his friend Williamson was, Orth replied, “He went out to roll a queer [who] had a lot of money.”
Williamson objected to Boyles’ testimony on hearsay grounds but the trial court admitted it under the co-conspirator’s exception to the hearsay rule. Alaska Rule of Evidence 801(d)(2)(E).2 Williamson contends on appeal that admission of the statement allegedly made by Orth was reversible error. He argues that the statement was not made in furtherance of any conspiracy.
The state concedes error, noting that the Alaska Supreme Court has recently reaffirmed the vitality of the “in furtherance of” requirement. See Crump v. State, 625 P.2d 857, 863 (Alaska 1981). See also Morris v. State, 630 P.2d 13, 17 (Alaska 1981). After an independent review of the record, we have decided to accept the state’s confession of error. See Marks v. State, 496 P.2d 66, 67-68 (Alaska 1972). Even assuming that the existence of a conspiracy between Williamson and Orth had been independently established by a preponderance of the evidence, see Hawley v. State, 614 P.2d 1349, 1355 (Alaska 1980); Amidon v. State, 565 P.2d 1248, 1259 (Alaska 1977), it is difficult to conceive how Orth could be found to be advancing the purpose of the joint undertaking by casually divulging it to witnesses. Crump v. State, 625 P.2d 857, 863 (Alaska 1981). The statement attributed to Orth by Boyles, that Williamson left the bar “to roll a queer,” can accurately be “described as a ‘casual admission of culpability to someone [Orth] had individually decided to trust.’ ” Crump, 625 P.2d at 863 (quoting United States v. Moore, 522 F.2d 1068, 1077 (9th Cir.1975), cert. denied, 423 U.S. 1049, 96 .S.Ct. 775, 46 L.Ed.2d 637 (1976)). We therefore hold that it was error to admit Orth’s statement through Boyles’ testimony.
The state contends, and, in his dissent, Judge Singleton agrees, that the admission of Orth’s out-of-court statement was harmless error. The state argues that the jury’s verdicts — which acquitted Williamson of robbery and second-degree murder while convicting him of manslaughter — indicate that the jury gave no weight to the inadmissible hearsay; the jury must have believed Williamson’s version that Dunkin was the first aggressor because an acquittal on the murder charge is inconsistent with a finding that Williamson intended to rob Dunkin. The state interprets the manslaughter conviction as reflecting a belief by the jury that Dunkin initially attacked Williamson but that Williamson had a reasonable means of escape and was therefore not entitled to use deadly force in self-defense. According to the state, the jury must have reasoned that, although Williamson was not entitled to claim self-defense because his conduct was unreasonable, he had nonetheless been provoked and had killed Dunkin in the heat of passion.3 The [970]*970state concludes that if the jury had given any weight to Orth’s statement Williamson’s defense would have been completely rejected because it is inconsistent with a predetermined plan to rob Dunkin.
We cannot agree that allowing the jury to consider evidence of Orth’s hearsay statement was harmless.4 Although the state’s theory is plausible, we cannot rely on after the fact speculation about the jury’s deliberations to conclude that the jury disregarded the highly inflammatory hearsay testimony. Williamson’s assertion of an innocent motive for leaving the Hal-lea Lodge was crucial to his claim of self-defense; the statement attributed to Orth by Boyles directly undermined Williamson’s version of the events. Although the state presented other evidence to support its theory that Williamson had formulated a plan to rob Dunkin,5 Orth’s hearsay statement was the only unimpeached evidence supporting that theory. The state relied almost exclusively on Boyles’ testimony during closing argument to support its theory.
Under the circumstances, the jury’s verdicts could very possibly have been affected by Boyles’ testimony concerning Orth’s statement.6 We therefore [971]*971hold that the error in admitting Orth’s hearsay statement was not harmless beyond a reasonable doubt and that Williamson’s manslaughter conviction must be reversed.7
EVIDENCE OF DUNKIN’S CHARACTER
Our disposition of this case requires us to discuss the other evidentiary issues Williamson has raised to provide guidance to the trial court on retrial.
Williamson contends that the trial court erred in excluding the testimony of Thomas Parkhurst. Williamson’s offer of proof established that Parkhurst was willing to testify that he had had a similar encounter with Dunkin approximately one year prior to Williamson’s offense. Parkhurst met Dunkin in a bar and Dunkin invited him to go outside and smoke a joint. Parkhurst accepted and they went out to Dunkin’s car, where Dunkin pulled out a prescription bottle of Quaaludes and offered them to Parkhurst. Parkhurst would have testified that he ingested two or three Quaaludes and smoked two joints with Dunkin. Because he had been drinking heavily, Park-hurst became groggy and began to lose his coordination. Dunkin locked the doors of his vehicle at one point, explaining that he was paranoid about someone walking up to the car. Dunkin ultimately moved closer to Parkhurst, reached out for him, and told him that he was bisexual. Parkhurst jumped out of Dunkin’s car to get away. Parkhurst was prepared to testify that this episode left him with the firm impression that Dunkin was attempting to eliminate his resistance with drugs and then homosexually rape him.
Judge Ripley ruled that Parkhurst would not be permitted to testify before the jury. He determined that Parkhurst’s testimony was not probative on the issue of self-defense because it demonstrated his character for seduction rather than violence. He concluded that any probative value was outweighed by “the prejudice to the state, confusion of the issues, and the foreseeable waste of time.”
Williamson challenges the exclusion of Parkhurst’s testimony on appeal, arguing that Dunkin’s conduct on the prior occasion was so similar to Williamson’s account of the events on Halloween night of 1981, that the evidence was highly probative and should have been admitted as relevant character evidence under Alaska Rule of Evidence 404(a)(2).8 We agree.
[972]*972In Kvasnikoff v. State, 674 P.2d 302 (Alaska App.1983), a homosexual rape case, we reviewed the trial court’s exclusion, under the rape victim shield law,9 of evidence of the complaining witness’ past homosexual behavior. We held that the trial court did not abuse its discretion in determining that the probative value of the evidence was outweighed by “the probability that its admission [would] create undue prejudice, confusion of the issues, or unwarranted invasion of the privacy of the victim.” Id. at 305-06. We noted that the rape victim shield statute rejected the archaic rule of relevancy which assumed that a person “who consented to sex with one individual was more likely to have consented to sex with another.” Id. at 306. We also noted that the probative value of the evidence offered by Kvasnikoff was diminished by the fact that it did not “involve acts which were substantially similar to those charged.” Id. at 306 n. 6.
However, we also recognized in Kvasni-koff that evidence of the victim’s homosexual behavior on a prior occasion may be admissible under certain circumstances. Specifically, we said:
Trial courts should focus on factors other than sexual preference in determining what evidence is relevant and has probative value with regard to the defense of consent. Evidence which tends to demonstrate past sexual conduct under circumstances which are substantially similar to the act now charged has greater probative value and relevancy. See State v. Mounsey, [31 Wash.App. 511] 643 P.2d 892, 898 (Wash.App.1982).
Id.
We believe that Williamson’s case is distinguishable from Kvasnikoff and that evidence of Dunkin’s character should have been admitted. Although the trial court’s task under the rape shield statute is similar to the general test for admissibility of character evidence under A.R.E. 404(a)(2), the former was specifically designed to “minimize the embarrassment and humiliation to the prosecuting witness” in a rape case. Kvasnikoff, 674 P.2d at 305 n. 4. Concern for the sensibilities of the victim deserves substantially less weight in a murder case where the issue is self-defense and where the jury must determine who was the initial aggressor.
In addition, the probative value of Parkhurst’s testimony in Williamson’s case was bolstered by the substantial similarities between the two episodes. Park-hurst’s testimony created more than a simple inference that Dunkin had a propensity to engage in homosexual conduct. If believed, Parkhurst’s testimony would have created an inference that Dunkin had provided drugs for the purpose of luring Park-hurst into his car, lowering his resistance, and obtaining nonconsensual sex — a scenario almost identical to Williamson’s account of his confrontation with Dunkin. Even if an element of violence or aggression was required to establish the relevancy of a homicide victim’s'past behavior, the potential for violence in the situation as [973]*973Parkhurst described it was clear. The relevancy of Parkhurst’s testimony was not diminished by the fact that he was able to escape before any violence occurred. Indeed, assuming Parkhurst’s account is believed, the ease with which Parkhurst managed to escape might have been a factor which prompted Dunkin to use a greater level of force in his encounter with Williamson.
The relevancy of Parkhurst’s testimony is highlighted by taking into account the diametrically opposed theories presented at trial. This was not simply a dispute between the prosecution and the defense about who was the initial aggressor. Rather, the state contended throughout trial and during closing argument that this was a case of premeditated robbery and murder, while the defense portrayed Williamson as an innocent victim of an attempted sexual assault. Under the circumstances, the probative value of Parkhurst’s testimony was unquestionably great, since it tended to corroborate the totality of Williamson’s testimony, and not just his account of who was the initial aggressor. Thus, the jury would have been much more likely to believe Williamson’s testimony if it had heard and believed Parkhurst.
We conclude that on retrial Williamson should be allowed to present the testimony of Thomas Parkhurst.
EVIDENCE THAT DUNKIN HAD QUAALUDES
Williamson next contends that the trial court erred in excluding evidence that police officers had found a partially used prescription bottle of Quaaludes and a prescription for Quaaludes in Dunkin’s home during the investigation. The trial court found that this evidence fell within the protective order, issued earlier by the court, which banned evidence of Dunkin’s character.
We believe that this evidence should be admitted on retrial. Evidence that Dunkin had access to Quaaludes is particularly relevant in light of the dispute between the prosecution and the defense about Williamson’s motive for getting into Dunkin’s car. The state maintained that Williamson brought a gun with him to the bar and had formed a plan to rob Dunkin, while the defense insisted that Dunkin lured Williamson into his car with a promise of Quaa-ludes. The fact that Dunkin had a partially empty prescription bottle of Quaaludes at his home had a tendency to make Williamson’s version more likely than it would have been without the evidence. See A.R.E. 401. See also Newsom v. State, 533 P.2d 904, 908 (Alaska 1975).
Although perhaps incidentally reflecting on Dunkin’s character, the extrinsic evidence offered by Williamson was probative of a fact that was directly in issue. Because Dunkin apparently had a valid prescription for the Quaaludes, the danger of embarrassing his family or unfairly prejudicing the state was slight. The dangers inherent in presenting extrinsic evidence on a collateral matter were not a factor. The presentation of this evidence would have taken very little time and the potential for confusing the jury was minimal. See A.R.E. 403. Thus, Williamson should be allowed to introduce evidence of Dunkin’s access'to Quaaludes on retrial.
TAMPERING WITH PHYSICAL EVIDENCE
Williamson was convicted of two counts of tampering with physical evidence, in violation of AS 11.56.610(a)(1) and AS 11.56.610(a)(4). He received two concurrent five-year sentences. Williamson does not challenge these convictions or sentences on appeal. However, the state concedes that Williamson should only have received one sentence for tampering with the evidence in this case. We agree with the state and, finding plain error, we vacate Williamson’s sentences on the tampering charges and remand for resentencing. Alaska R.Crim.P. 47(b).
Alaska Statute 11.56.610 provides:
Tampering with physical evidence, (a) A person commits the crime of tampering with physical evidence if the person
[974]*974(1) destroys, mutilates, alters, suppresses, conceals, or removes physical evidence with intent to impair its verity or availability in an official proceeding or a criminal investigation;
(2) makes, presents, or uses physical evidence, knowing it to be false, with intent to mislead a juror who is engaged in an official proceeding or a public servant who is engaged in an official proceeding or a criminal investigation;
(3) prevents the production of physical evidence in an official proceeding or a criminal investigation by the use of force, threat, or deception against anyone; or
(4) does any act described by (1), (2), or (3) of this subsection with intent to prevent the institution of an official proceeding.
(b) Tampering with physical evidence is a class C felony.
It seems apparent that subparagraph (a)(4) simply provides an alternative mens rea for each of the three other subsections. Where, as here, only one act of tampering is alleged by the state,10 a defendant cannot be convicted of two counts merely because he may have simultaneously entertained both of the alternative mental states. We therefore accept the state’s concession of error and hold that only one sentence was appropriate in Williamson’s case. See Whitton v. State, 479 P.2d 302, 312 (Alaska 1970).
Williamson’s conviction for manslaughter is REVERSED and the case is REMANDED for a new trial. Williamson’s sentences for tampering with physical evidence are VACATED and the case is REMANDED for resentencing.