[415]*415LENT, J.
The defendant was charged with rape in the first degree, ORS 163.375; kidnapping in the first degree, ORS 163.235; and three counts of sodomy in the first degree, ORS 163.405. All of the charges arose out of conduct involving the same victim in Portland, Oregon on January 8, 1978. A jury found the defendant guilty on all five counts. The trial court sentenced the defendant to máximums of 20 years on the rape charge, 20 years on the kidnapping charge, and 20 years on each sodomy charge, each sentence to run consecutively, for a total term not to exceed 100 years.
The defendant appealed to the Court of Appeals, which affirmed the conviction from the bench, 37 Or App 675, 588 P2d 687 (1978). This court allowed review, ORS 2.520; 287 Or 129, 592 P2d 1021 (1979).
The defendant raises three principal arguments on review. He contends that a separate conviction and sentence for kidnapping is contrary to the legislative intent of ORS 163.235; that the several sexual offenses should be treated as a single criminal episode and therefore should not be punished separately; and that if the separate sexual offenses are punished separately, the sentences should be held excessive under substantive sentence review, ORS 138.040.
At about 8:30 p.m. on January 8, 1978, the defendant, walking on a street in Portland, grabbed the victim, a female who was walking alone. He put his hand over her mouth and a knife at her throat and told her not to say anything. He forced her to cross the street and walk two blocks and then across another street. He then took her behind a house and forcibly raped and sodomized her. These events consumed about forty minutes.
I
The defendant argues that a separate conviction and sentence for kidnapping is improper. The answer [416]*416to this contention is found in the relevant kidnapping statutes.
The 1971 legislature adopted the present kidnapping statutes1 as part of the complete revision of the Oregon Criminal Code. The 1967 legislature created the Oregon Criminal Law Revision Commission to revise the criminal laws of this state. Carefully kept records of the proceedings of the Commission and of its subcommittees were preserved and, accordingly, provide a rich source for determination of the drafters’ intent. The Commission’s first draft of the kidnapping sections was adopted from the Model Penal Code2 and contained the following commentary:
[417]*417"Current kidnaping statutes apply to abductions which are incidental to or an integral part of the commission of an independent crime such as robbery or rape where the victim is removed and confined for a given period to effectuate the criminal purpose. Where the detention period is brief there is no genuine kidnaping. However, cases of this nature are sometimes prosecuted as kidnaping in order to secure the death penalty or life imprisonment for behavior that amounts in substance to rape or robbery in jurisdictions where these offenses are not subject to such penalties. People v. Chessman, 238 P2d 1001 (1951). The Model Penal Code and the New York Revised Penal Law have tried to exclude this type of case from first degree kidnaping by differentiating on the basis of the movement and duration of detention of the victim. The Model Penal Code provides for kidnaping only where the kidnaper removes the victim from his place of residence or business, or a substantial distance from the vicinity where he is found, or if the kidnaper unlawfully confines the victim for a substantial period in a place of isolation. New York has selected the arbitrary figure of twelve hours to designate the point in the course of a criminal project at which the abduction becomes a major offense in itself and not merely a facet of some other crime.”
The minutes following the presentation of the first draft indicate that the drafters considered the situation where kidnapping charges are brought in addition to robbery or rape charges. The minutes reveal that the drafters intended to prevent conviction and sentencing for kidnapping when the detention was merely incidental to a rape or robbery.3 The difficulty facing [418]*418the drafters, however, was to provide the flexibility to cover diverse kidnapping fact situations, yet rationally restrict prosecutorial discretion to punish.4
[419]*419The language of the proposed kidnapping statutes was revised three times.5 The commentary following each revision included the above-quoted passage.6 This [420]*420passage was also included in the tentative and final draft commentaries, but the drafters added the following paragraph:7
"The proposed draft solves this problem [of excluding abductions which are incidental to or an integral part of the commission of an independent crime] by strictly limiting kidnapping in the first degree to only those instances where the actor’s purpose in abducting falls within subsection (1) of [ORS 163.235 (Kidnapping in the First Degree)].”
This paragraph of commentary is less than clear. In the preceding paragraph of commentary, the drafters discussed the problem of unwarranted kidnapping convictions where the abduction is merely incidental to a robbery or rape, citing the Model Penal Code and New York approaches to this problem. The "solution,” however, refers only to Oregon’s first degree kidnapping statute, and states that this offense is strictly limited by the words of the statute itself.
From this history we draw the inference that the Commission, and subsequently the legislature, intended that there be no conviction of the defendant for the separate crime of kidnapping where the detention or asportation of the victim is merely incidental to the accomplishment of another crime, particularly that of robbery or rape. On the other hand, we infer that the Commission and legislature perceived no reason not to prosecute and punish a malefactor for the separate crime of kidnapping where the detention or asportation is not merely incidental to the commission of the underlying crime.
The drafting technique utilized to accomplish the legislative purpose is manifested in the definition of the crime of kidnapping. The Commission reasoned that even though the malefactor’s conduct offended [421]*421the statutory injunctions against rape or robbery, he would be guilty of kidnapping also if in committing rape or robbery he took the victim a "substantial distance” or held the victim "a substantial period of time.” See n. 3, supra.8 As finally enacted the law does not even require that there actually be a substantial interference with the victim’s personal liberty; it is only necessary that the perpetrator have the "intentto interfere substantially” with the victim’s personal liberty to make the malefactor guilty of kidnapping if he commits an act proscribed by ORS 163.225. We find nothing in legislative history to indicate the legislature intended by its adverb "substantially” anything other than was intended by the Commission in its use of the adjective "substantial.”
The end result is that the legislature has left it to the process of adjudication to determine whether there was an intent to interfere substantially. Compare Miss Lavorato’s discourse in footnote 3, supra.
The mechanics of determining whether there is a separate crime of kidnapping do not initially depend on a post verdict inquiry. Assume that one is charged, as in the case at bar, with both rape and kidnapping against the same victim. To raise the issue of his liability for a separate conviction of kidnapping, at the appropriate time the defendant can test the sufficiency of the state’s evidence to support the element of his intent by a motion for judgment of acquittal on the kidnapping charge. ORS 136.445. As in other cases the trial judge must then determine whether the evidence, viewed in the light most favorable to the prosecution, is sufficient to justify a rational factfinder in finding such intent beyond a reasonable doubt. Jackson v. Virginia, 443 US 307, 99 S Ct 2781, 61 L Ed2d 560 (1979). See also, Pilon v. Bordenkircher, 441 US [422]*4221, 100 S Ct 7, 62 L Ed2d 1 (1979). If the ruling is adverse, the claim of error has been preserved and the contention of want of the requisite intent may be presented to the appellate courts in case of a verdict of guilty. If on appeal it is held that there was trial court error in this respect, the conviction resulting from the verdict will be reversed. If there is held to be no error, the defendant will have been found to be guilty of the separate crime of kidnapping as intended by the legislature and therefore subject to punishment for that crime because he has been adjudged guilty of conduct which the legislature has found to be not "merely incidental” to the rape.
There is no occasion in this case for this court to determine whether there was sufficient evidence to prove the element of intent under ORS 163.225. There was no motion for acquittal in the trial court. The trial court instructed that the jury must find such intent beyond a reasonable doubt. The jury so found. Defendant requested no special instruction concerning this element. Defendant did not raise this issue at the time of sentencing.9 In the Court of Appeals the defendant was unable to make any assignment of error in this respect which could comply with Rule 7.19, Rules of Procedure, Supreme Court and Court of Appeals of the State of Oregon. The Court of Appeals affirmed from the bench, and we have no way of knowing the basis of its rejection of this claim of the defendant that his separate conviction and sentence for kidnapping is error. Whatever the reason of that court, it did not err in this respect.
[423]*423In summary, the legislature said there may be a separate conviction and sentence for kidnapping only when it is not incidental to another crime, and it may be found not to be incidental if the defendant had the intent to interfere substantially with the victim’s personal liberty. That intent was here charged and found by the jury. There was no challenge to the sufficiency of the evidence to support that finding. Through the adjudicative process, as intended by the legislature, it has been established that the detention and asportation of this victim by this defendant was not "merely incidental” to his rape upon her. The defendant’s position for "merger” of the kidnapping conviction and sentence into the rape conviction and sentence rests upon the contention that the kidnapping was merely incidental to the rape. The position is not well taken and the contention is rejected.
II.
The defendant’s second argument is that the several acts of sodomy committed in a single criminal episode should result in a single sodomy conviction and therefore a single sentence. The defendant alternatively contends that the rape conviction and the sodomy convictions should be treated as a single criminal episode and therefore should not be punished separately. The defendant may be charged with several counts of both rape and sodomy arising out of the same episode, and the jury may consider the several counts in the single prosecution. See State v. Cloutier, 286 Or 579, 586, 596 P2d 1278 (1979). The issue in this case is whether the defendant who is found guilty by the trier of fact on the several counts can be cumulatively sentenced.
A. The several acts of sodomy.
The defendant at the sentencing proceeding argued to the trial judge that "the sodomies would merge and that judgment could only be entered upon the conviction for rape, kidnapping, and one sodomy. "(Emphasis [424]*424added). The defendant did not raise this specific argument in September, 1978, when the case was argued in the Court of Appeals; rather, he argued that the 100-year sentence was excessive. At that time, the Court of Appeals’ decision in State v. Cloutier, 33 Or App 121, 575 P2d 996 (1978), had not yet been reversed by this court. The Court of Appeals’ decision in Cloutier concluded that the definition of an "offense” in ORS 161.505 permitted separate convictions and separate sentences for the several offenses committed in a burglary/theft episode. This court reversed that decision on June 12, 1970, 286 Or 579, and concluded that a policy of rationality and proportionality should be applied in the sentencing of a multiple offender:
"Taken together, the legislature’s recent enactments reflect a continuing policy to bring rationality and proportionality to the penal dimension of criminal law, a dimension often marked by haphazard statutory penalties, by a deliberate or fortuitous multiplicity of charges, and by the tactical opportunities these factors offer in plea negotiations.” 286 Or at 594.
One week prior to oral argument in this court, defendant filed a "Memorandum of Additional Authorities,” in which, in light of our decisions in Cloutier and State v. Harris, 287 Or 335, 599 P2d 456 (1979), he reasserted his argument made in the trial court that a single sentence for sodomy was the appropriate disposition for his sodomitical conduct. The defendant, in oral argument before this court on September 7, 1979, stated:
"In light of the opinion in Cloutier, as I pointed out in my memorandum of supplemental authorities, there is one point that we wish to bring up again that was brought out at the time of sentencing originally in the trial court, and that’s the question of how many sentences on sodomies can be imposed.”
The defendant then argued that one sentence was appropriate because the first degree sodomy statute was violated in three different ways in a single episode. The state responded to this argument stating [425]*425that separate sentences are justified for each act of sodomy because the victim is subjected to additional humiliation and fear, citing State v. Steele, 33 Or App 491, 577 P2d 524 (1978).
The defendant’s argument that one sentence should be imposed for the sodomy offenses was timely raised in the trial court, and was argued before this court. We believe, in all the circumstances, this question is in an appropriate procedural position for this court’s consideration. Cf., Rule 7.19, Oregon Rules of Appellate Procedure.
The first degree sodomy statute, ORS 163.405, uses the term "engage in deviate sexual intercourse,” which is further defined in ORS 163.305(1) as "sexual conduct between persons consisting of contact between the sex organs of one person and the mouth or anus of another.” In the present case, three counts of sodomy were charged because the defendant engaged in deviate sexual intercourse in at least three different ways in the same episode.10
The separate counts of sodomy are appropriate in the prosecutorial stage because the prosecution may be able to prove one type of sodomy but not another. The jury may appropriately return verdicts of guilty on all three counts. At the sentencing stage, however, the court’s concern is with the defendant’s criminal responsibility for a single criminal episode.* 11
The term "criminal episode” is defined in ORS 131.505(4) for purposes of former jeopardy:
" 'Criminal episode’ means continuous and uninterrupted conduct that establishes at least one [426]*426offense and is so joined in time, place and circumstances that such conduct is directed to the accomplishment of a single criminal objective.”
This case does not involve former jeopardy issues; however, the term "criminal episode” is relevant to the sentencing stage because it prescribes when the required joinder of offenses will bring the offenses before the sentencing court in one proceeding. See State v. Cloutier, supra, 286 Or at 595.
No statute in Oregon authorizes or prohibits multiple sentences when the same criminal statute is violated more than once in a single criminal episode. This court held in State v. Welch, 264 Or 388, 505 P2d 910 (1973), that the publishing of two forged checks in the same transaction constituted one offense and therefore separate sentences on the two counts was improper. The court looked for legislative intent behind the forged instrument statute, and, finding no legislative history, the court found guidance from the Supreme Court in Bell v. United States, 349 US 81, 75 SCt 620,99 LEd 905 (1955). The defendant in that case was prosecuted under the Mann Act for transporting two women in one trip across state lines for immoral purposes. The Supreme Court held that the defendant was not subject to separate sentences on the two counts. The court noted the ambiguity in the possible units of the offense but concluded, "It may fairly be said to be a presupposition of our law to resolve doubts in the enforcement of a penal code against the imposition of a harsher punishment.” 349 US at 83. The rationale compelling a single conviction in Welch and Bell was that the defendant should not be twice punished for one criminal episode unless the legislature has clearly prescribed additional penalties. Cf., A. Campbell, Law of Sentencing, 241-246 (1978).
The facts of the present case, however, can be distinguished from State v. Welch, supra, and Bell v. United States, supra, because in those cases, the [427]*427defendant simultaneously committed two identical criminal violations; in the present case the defendant in the course of the criminal episode committed successive, repeated acts of rape and sodomy.
The first degree rape statute, ORS 163.375, uses the term "sexual intercourse” which, under ORS 163.305(7), "occurs upon any penetration however slight ***.” A rape episode may involve more than one penetration, yet it would be absurd to sentence the defendant to twenty years for each act of penetration. The severity of the sentence for the single episode of rape should reflect the aggravated circumstances of a particularly brutal or prolonged rape. Likewise, there may be several deviate contacts in one episode of sodomy. Separate sentences for each deviate contact result in a punishment disproportionate to the defendant’s criminal responsibility for a single criminal episode. Cf., People v. Tate, 37 Ill App 3d 358, 346 NE2d 79 (1976) (several acts of sodomy in a single episode constitute a single offense); People v. Cox, 53 Ill 2d 101, 291 NE2d 1 (1972) (violation of the same sexual offense statute in two different ways in one episode constitutes one offense). See, Note, Cumulative Sentencing for Offenses Within a Single Transaction, 26 Fla L Rev 367 (1974).
By analogy, there are statutes in Oregon which may be violated in several distinct ways. For example, the offense of robbery in the first degree, ORS 164.415, can be committed in three different ways: by being armed with a deadly weapon, by using or attempting to use a dangerous weapon, and by causing or attempting to cause serious physical injury to any person. If a robber, armed with a loaded pistol, first brandished his pistol, then, moments later, pulled a knife and attempted to stab his victim, then took the victim’s wallet and fled, would he be subject to three separate 20-year sentences for robbery? The legislature never addressed this question, so the courts are left with a difficult policy choice. Certainly the victim is exposed [428]*428to additional fear, danger, and humiliation by the successive assaults.12 Yet, the length of a single sentence for first degree robbery should reflect the aggravated circumstances of the crime.
The first degree robbery statute can be violated three different ways; there is no denominated offense of "armed robbery” as distinguished from "robbery by using a dangerous weapon.” Likewise, the first degree sodomy statute can be violated in at least three different ways: the offender can put his mouth to the victim’s genitals, or he can put his genitals to the victim’s mouth, or to her anus. It is a misstatement to say, as does the dissent, there is an "offense of oral sodomy” as differentiated from "the separate offense of anal sodomy.”
[429]*429The dissent implies that the sodomitical conduct took place over a period of almost 40 minutes. Actually the entire course of criminal conduct lasted 40 minutes.
Separate punishments for several acts of sodomy would be appropriate if the defendant, after one act, starts anew after a time of reflection. See Remington and Joseph, Charging, Convicting and Sentencing the Multiple Criminal Offender, 1961 Wis L Rev 528,548-549 (1961). Cf., Lillard v. State, 528 SW2d 207 (Tenn Cr App 1975). The time period when one episode ends and another begins is not always clear. Cf., State v. Welch, supra, 264 Or at 394-395. In the present case, however, the defendant’s conduct can clearly be said to involve a single criminal episode, therefore one conviction and sentence for sodomy is appropriate.
Accordingly we hold that the trial court erred in imposing separate sentences for the three counts of sodomy in a single episode and that the case must be remanded for resentencing. The sentence imposed may appropriately reflect that the victim was exposed to additional fear, danger, and humiliation by the successive offenses of sodomy in the single episode.
B. The rape and sodomy sentences.
The defendant alternatively contends the rape and sodomy were two offenses within a single criminal episode with a single criminal objective, therefore only one sentence is appropriate.
The defendant could be described as having a criminal objective to violate sexually his victim; nevertheless, he did commit sexually offensive acts which the legislature has chosen to differentiate as rape and sodomy. Cf., Johnson, Multiple Punishment and Consecutive Sentences, 58 Cal L Rev 357, 364-365 (1970). Although the offenses of rape and sodomy in this case share a unity of time, location, circumstance, and objective, the legislature has chosen to make rape and [430]*430sodomy two distinct offenses requiring different elements of proof. A rape always requires proof of a penetration, however slight, see ORS 163.305(8), whereas a sodomy always requires proof of a deviate sexual contact, see ORS 163.305(1). We conclude, therefore, that the legislature intended that separate sentences were permissible for rape and sodomy offenses arising out of the same criminal episode.
Ill
Although the Oregon Legislature has not specifically limited the trial court’s discretion to impose consecutive sentences,13 the trial court does not have unlimited discretion to impose consecutive sentences for the separate offenses. Sentencing practices must conform to the stated purposes of the revised criminal code in ORS 161.025: "[t]o prescribe penalties which are proportionate to the seriousness of offenses,” and "[t]o safeguard offenders against excessive, disproportionate or arbitrary punishment.”14
Arbitrary sentencing practices have recently become the subject of widespread concern, generating substantial criticism.15 The lack of guidelines for im[431]*431posing concurrent and consecutive sentencing is a particular problem in modern sentencing practices.16 The Model Penal Code,17 the Model Sentencing Act,18 and the ABA Standards Relating to Sentencing Alternatives and Procedures19 all state a clear preference for [432]*432concurrent over consecutive sentences for multiple offenses within a single criminal episode.20 The ABA Standards state that the court should be authorized to impose consecutive sentences only after a finding that this is necessary to protect the public.21
ORS 137.120(2) requires the sentencing court in felony convictions to state on the record the reasons for the sentence imposed. This requirement was added in 1977 to cause the trial court to clarify the court’s sentencing rationale and to supply information for possible sentence review.22 Cf., State v. Biles 287 Or 63, 597 P2d 808 (1979). In light of this mandate for articulated sentencing rationales and the current recognition that consecutive sentences are appropriate only when the defendant poses an unusual risk to the safety of the public, we hold that the trial judge must affirmatively state the reasons for imposing consecutive sentences for separate offenses arising from the same criminal episode. These reasons must be consistent with the legislative policies concerning proportional sentencing, rehabilitation, deterrence, and protection of the public. Cf., ORS 161.025(l)(f)(g); ORS 144.780; People v. Meints, 41 Ill App 3215, 355 NE2d 125, 129-130 (1976); State v. Underwood, 353 So2d 1013, 1019 (La 1977); State v. Carroll, 66 NJ 558, 334 A2d 17 (1975); Gray v. State, 538 SW2d 391 (Tenn 1976).
[433]*433We now examine the trial court’s sentencing rationale in the present case. The presentence report recommended one hundred years incarceration with a minimum of fifty years imprisonment for the seventeen-year-old defendant. The trial judge sentenced him to five consecutive twenty-year terms but directed a minimum sentence of ten years, stating the judge’s hopes for reformation. He stated that defendant’s insult to another human being deserved punishment and that he hoped the sentence would have a deterrent effect. The judge noted the defendant’s refusal to accept psychiatric help and stated that society was entitled to be protected from the defendant’s predatory conduct.23
IV
The defendant claims that his sentences should be held excessive under substantive sentence review, ORS 138.040. The defendant’s legal challenges to the separate sodomy sentences and our disposition thereof result in a remand for resentencing. The trial court will sentence anew and there is nothing now before us upon which to exercise sentence review under ORS 138.040. Neither is there any occasion to consider whether this court is empowered under that statute to conduct an independent review.
Remanded for resentencing.