An issue of first impression is presented in this appeal asking whether the offense of taking immodest, immoral or indecent liberties with a child is a lesser included offense of second-degree sexual assault. Appellant, Frank W. Derksen (Derksen), contends it was plain error to permit the lesser included offense instruction from which his conviction resulted. We agree.
I. ISSUES
Appellant states multiple issues for this court’s consideration:
ISSUE I
Was it plain error to allow jury instruction no. 12 which stated that taking immodest, immoral, or indecent liberties with a minor is a lesser-included offense of second degree sexual assault?
ISSUE II
Did the trial judge abuse his discretion by failing to afford the defendant his constitutionally protected right of allocution and by relying on improper information when sentencing the defendant?
ISSUE III
Was it plain error to allow a ten-year-old “borderline” mentally retarded child to *1385testify absent a determination of her competency?
ISSUE IV
Did the prosecutor repeatedly overstep and ignore rules prohibiting him from asserting as fact his own personal beliefs relating to matters in issue so as to adversely affect the defendant’s substantial right to a fair trial?
ISSUE V
Was [the grandmother’s] testimony concerning the “yellow mess” in the child’s underpants improperly admitted?
ISSUE VI
Was there sufficient evidence to convict appellant of taking immodest, immoral or indecent liberties with a minor?
ISSUE VII
Was the Victims Compensation assessment made in violation of law?
ISSUE VIII
Should Appellant’s conviction be reversed pursuant to the doctrine of cumulative error?
The State, in response, summarizes the issues as:
I. Was appellant properly convicted of taking immodest, immoral or indecent liberties with a minor?
II. Was the prosecutor’s argument proper comment upon the evidence admitted at trial?
III. Did the district court properly use the pre-sentence investigation report during sentencing and did it afford appellant all constitutional rights?
IV. Is the doctrine of cumulative error inapplicable to appellant’s conviction since no error appears in the record?
II. FACTS
In the summer and early fall of 1988, the victim was ten years old. The victim lived with her paternal grandparents, but was allowed to visit her stepfather, Derksen, and her natural mother at their home near Wheatland, Wyoming under terms of a custody decree. During one of those visits, Derksen allegedly tied the victim’s hands so he could remove her clothes and fondle her. Later, Derksen disrobed, according to the victim, and forced her to touch his penis and put it in her mouth. Derksen also reportedly displayed to the victim lewd pictures of himself and the victim’s mother.
More than two years after this incident reportedly took place, by information, Derksen was charged with second-degree sexual assault. During the instruction conference at Derksen’s jury trial, the defense initially objected to a state offered instruction for taking immodest, immoral or indecent liberties with a child as a lesser included offense. However, the objection was withdrawn after an unreported conference was held between the judge, prosecutor and defense lawyer.
The jury convicted Derksen of the “lesser” offense, taking immodest, immoral or indecent liberties, and he was sentenced to not less than nine years nor more than ten years in the Wyoming State Penitentiary and assessed $500 for the Wyoming Victim’s Compensation Fund. Additional relevant facts will be included in the discussion as necessary.
III. DISCUSSION
Without a preserved objection, at trial, the disputed lesser included offense instruction requires analysis under the plain error doctrine.
Our standard of review under plain error is well established.
“ ‘First, the record must be clear as to the incident which is alleged as error. Second, the party claiming that error amounted to plain error must demonstrate that a clear and unequivocal rule of law was violated. Finally, that party must prove that a substantial right has been denied him and as a result he has been materially prejudiced.’ ”
Johnston v. State, 747 P.2d 1132, 1134 (Wyo.1987) (quoting Auclair v. State, *1386660 P.2d 1156, 1159 (Wyo.1983) cert. denied 464 U.S. 909, 104 S.Ct. 265, 78 L.Ed.2d 249 and Bradley v. State, 635 P.2d 1161, 1164 (Wyo.1981)). .See [W.R.Cr.P. 52(b)].
Craney v. State, 798 P.2d 1202, 1204 (Wyo.1990).
The record in this proceeding is sufficient to evaluate the contentions of error. Jury Instruction Nos. 12 through 15 permitted the jury to convict Derksen of taking immodest, immoral or indecent liberties as a lesser included offense. Jury Instruction No. 12 specifically stated:
If you are not satisfied beyond a reasonable doubt that the defendant is guilty of the offense charged, he may, however, be found guilty of any lesser offense, the commission of which is necessarily included in the offense charged, if the evidence is sufficient to establish his guilt of such lesser offense beyond a reasonable doubt.
The offense of sexual assault in the second degree, with which the defendant is charged, includes the lesser offense of taking immodest, immoral or indecent liberties with a child.
Derksen has fulfilled the first requirement of the plain error test.
Demonstrating that a clear and unequivocal rule of law has been violated, the second portion of the plain error test requires consideration of the lesser included offense doctrine as defined by W.R.Cr.P. 31(c).1
The defendant may be found guilty of an offense necessarily included in the offense charged or of an attempt to commit either the offense charged or an offense necessarily included therein if the attempt is an offense.
The lesser included offense doctrine benefits the prosecution when it fails to establish each of the elements of the charged crime and the doctrine benefits the defendant because it provides the jury a “ ‘less drastic alternative than the choice between conviction of the offense charged and acquittal.’ ” State v. Selig, 635 P.2d 786, 790 (Wyo.1981) (quoting Beck v. Alabama, 447 U.S. 625, 100 S.Ct. 2382, 2387, 65 L.Ed.2d 392 (1980)).
In Wyoming, an offense is “necessarily included” in the charged offense when “ ‘the elements of the lesser offense are identical to part of the elements of the greater offense * * Selig, 635 P.2d at 790 (quoting United States v. Chapman, 615 F.2d 1294, 1299 (10th Cir.1980), cert. denied 446 U.S. 967, 100 S.Ct. 2947, 64 L.Ed.2d 827 (1980)).2 Accord Pearson v. State, 818 P.2d 1144, 1148 (Wyo.1991); Craney, 798 P.2d at 1205-06; Keller v. State, 771 P.2d 379, 383-84 (Wyo.1989); Eatherton v. State, 761 P.2d 91, 95 (Wyo.1988); Miller v. State, 755 P.2d 855, 865 (Wyo.1988); Seeley v. State, 715 P.2d 232, 238 (Wyo.1986); Amin v. State, 694 P.2d 119, 122-24 (Wyo.1985); and Balsley v. State, 668 P.2d 1324, 1327 (Wyo.1983).
The elements of the crime of sexual assault in the second degree, Wyo.Stat. § 6-2-303 (1988), require:
(1) an actor
(2) who inflicts
(3) sexual intrusion
(4) on a victim
(5) less than twelve years of age
(6) while the actor is more than four years older.
The elements of the crime of taking immodest, immoral or indecent liberties, Wyo. Stat. § 14-3-105 (1986), punish:
(1) any person
(2) knowingly
*1387(3) taking immodest, immoral or indecent liberties
(4) with any child.
This court has held that the word “child” in this statute refers to any one under the age of nineteen years. Campbell v. State, 709 P.2d 425, 427 (Wyo.1985).
The elements of the claimed “lesser” offense, taking immodest, immoral or indecent liberties, are not identical to part of the elements of the greater offense, sexual assault in the second degree under the applicable standard. Selig, 635 P.2d at 790. Aside from the obvious discrepancies in the actor’s age3 and the victim’s age,4 the basic natures of the offenses differ. Rivera v. State, 840 P.2d 933 (Wyo.1992); McArtor v. State, 699 P.2d 288, 293 (Wyo.1985). The claimed “greater” offense punishes conduct involving sexual intrusion. The purported “lesser” offense punishes sexual intrusion as well as other forms of conduct. Each statute is intended “to suppress different evils * * Rivera, 840 P.2d at 942.
Sexual assault in the second degree requires proof of sexual intrusion. Sexual intrusion is defined as:
(A) Any intrusion, however slight, by any object or any part of a person’s body, except the mouth, tongue or penis, into the genital or anal opening of another person’s body if that sexual intrusion can reasonably be construed as being for the purposes of sexual arousal, gratification or abuse; or
(B) Sexual intercourse, cunnilingus, fellatio, analingus or anal intercourse with or without emission.
Wyo.Stat. § 6-2-301(a)(vii) (1988). The provisions of the sexual assault in the second degree statute prohibit a form of rape, a common law crime of violence directed against a person.
The offense of taking immodest, immoral or indecent liberties covers a broader range of conduct than sexual intrusion. The jury in this case received Jury Instruction No. 14 stating: “Immodest, immoral or indecent liberties have a definite meaning because a person of ordinary intelligence can weigh his contemplated conduct against the prohibition of taking immodest, immoral or indecent liberties and know whether or not such contemplated conduct is prohibited.”5 Under this instruction, a broad range of conduct, including sexual contact6 as well as sexual intrusion, is prohibited by Wyo. Stat. § 14-3-105.
The case of Sorenson v. State, 604 P.2d 1031, 1032 (Wyo.1979) is instructive on the breadth of Wyo.Stat. § 14-3-105. Soren-son, while working at the home of the parents of his twelve-year-old victim, touched the breasts of the victim through her clothing. He also attempted to unbutton the victim’s shirt. In affirming Soren-son’s conviction for taking immodest, immoral or indecent liberties, this court held that the purpose of the statute was “ ‘to protect the morals of the child * * Id. at 1035 (quoting Dekelt v. People, 44 Colo. 525, 99 P. 330, 331-32 (1909)). Accord Gallegos v. People, 176 Colo. 191, 489 P.2d 1301 (1971).7 There were no allegations in Sorenson of conduct involving sexual intrusion.
In Montoya v. State, 822 P.2d 363, 365 (Wyo.1991), evidence of sexual intrusion *1388was presented in expert testimony from a physician. The expert testified that, based upon the results of the medical examination, a molestation had occurred. This court affirmed a conviction for taking immodest, immoral or indecent liberties.
In McArtor, a conviction for taking immodest, immoral or indecent liberties was affirmed based on evidence of consensual sexual intercourse. McArtor, 699 P.2d at 294. As Sorenson, Montoya and McArtor illustrate, the offense of taking immodest, immoral or indecent liberties punishes conduct which includes not only sexual intrusion, but also sexual contact and consensual sexual intercourse. The elements of taking immodest, immoral or indecent liberties are not identical to part of the elements of the claimed greater offense.
Under the terms of Jury Instruction No. 12, the jury was not satisfied beyond a reasonable doubt that Derksen committed sexual assault in the second degree. The sexual intrusion evidence, which was aggressively challenged in cross-examination and during expert testimony, was apparently not sufficient. The language of Jury Instruction No. 14, erroneously, permitted the jury to convict for taking immodest, immoral or indecent liberties as a lesser included offense by finding creditability in either the evidence of sexual contact or the evidence of the display of lewd photographs or both.
As a matter of law, the crime of taking immodest, immoral or indecent liberties, Wyo.Stat. § 14-3-105, cannot be a lesser included offense of sexual assault in the second degree. Wyo.Stat. § 6-2-303(a)(v). Derksen has met his burden of establishing the clear violation of a rule of law.
The final step in the plain error test requires establishing that a substantial right has been denied and material prejudice has resulted. A substantial right is implicated if an individual is convicted of a crime not charged or not “necessarily included” within the charged crime. Cra-ney, 798 P.2d at 1205; W.R.Cr.P. 31(c). Material prejudice results when there is no notice of the charges to be defended against. Craney, 798 P.2d at 1206; Selig, 635 P.2d at 793.
A substantial right of Derksen’s was violated when he was convicted of a crime not charged or not “necessarily included” within the charged crime. The State argues that despite the fact the elements of Wyo. Stat. § 14-3-105 are not identical to part of the elements of Wyo.Stat. § 6-2-303(a)(v), the lesser included offense instruction was proper. The State claims, “[j]ust because evidence of the greater element on intrusion may not have been accepted by the jury does not mean that the elements of immoral or indecent acts were not proved.”
The problem with the State’s argument is that it ignores a basic constitutional right — a defendant’s right to notice of the charges. When specific conduct violates more than one criminal statute, the state, at its option, may choose to prosecute for the violation of one statute or for the violation of multiple statutes under appropriate circumstances where multiple punishment is legislatively authorized. Cook v. State, 841 P.2d 1345 (Wyo.1992) (quoting Missouri v. Hunter, 459 U.S. 359, 368-69, 103 S.Ct. 673, 74 L.Ed.2d 535 (1983)); Bueno-Hernandez v. State, 724 P.2d 1132, 1141 (Wyo.1986), cert. denied 480 U.S. 907, 107 S.Ct. 1353, 94 L.Ed.2d 523 (1987). The nature of the charge or charges filed is a matter of prosecutorial discretion which is limited by constitutional guarantees of certain rights. Bueno-Hernandez, 724 P.2d at 1141; Jahnke v. State, 692 P.2d 911, 929 (Wyo.1984).
The United States Constitution8 and the Wyoming Constitution9 both assure *1389the right of a defendant to adequate notice of the accusations against him or her so that a defense may be prepared. McInturff v. State, 808 P.2d 190, 193 (Wyo.1991); Gonzales v. State, 551 P.2d 929, 930 (Wyo.1976). Under the notice provision of Wyo. Const, art. 1 § 10, a basic rule that the proof must correspond with the allegation means that a prosecution is not sustained by evidence which tends to prove a different offense than the one charged. Brantley v. State, 9 Wyo. 102, 106, 61 P. 139 (1900).
At the time of trial, former W.R.Cr.P. 9 provided that “the indictment or information shall be a plain, concise and definite written statement of the essential facts constituting the offense charged and it shall be signed by the prosecuting attorney.” W.R.Cr.P. 9(c). See W.R.Cr.P. 3 (restating information provisions of former Rule 9); W.R.Cr.P. 7 (restating indictment provisions of former Rule 9). The legal sufficiency of the charging document is tested by determining whether it fairly indicates the crime charged, states the essential elements of the alleged crime and is sufficiently definite to enable the defendant to prepare a defense and grants double jeopardy protection from further prosecution for the same offense. Gonzales, 551 P.2d at 933.
Derksen was charged, by information, with unlawfully
inflict[ing] sexual intrusion on [the victim], and at the time of the commission of the act, [the victim] was less than twelve (12) years of age, and Frank W. Derksen was a least four (4) years older than she, in violation of W.S. 6-2-303(a)(v) (second degree sexual assault).
At the time of arraignment, the trial court judge advised Derksen of the offense charged by reading the information and inquired:
[BY THE COURT] I must be sure that you understand with what you have been charged and the possible penalties. With what have you been charged, sir?
[BY DERKSEN] I’ve been charged with second degree sexual assault.
[BY THE COURT] What would be the possible penalties if you plead guilty or were found guilty of that charge?
[BY DERKSEN] Imprisonment for not more than 20 years and no less than $50 victims’ compensation fund and restitution and cost of public defender.
[BY THE COURT] Do you understand that?
[BY DERKSEN] Yes, I do.
[BY THE COURT] I’m then going to ask you then, Mr. Derksen, how you plead to the charge of second degree sexual assault involving one [victim’s name], guilty or not guilty?
[BY DERKSEN] Not guilty.[10]
The information provided notice to Derk-sen of the need to provide a defense to Wyo.Stat. § 6-2-303(a)(v), an offense involving sexual intrusion. No other offenses were charged. Before trial, Derk-sen filed a motion for a bill of particulars specifically requesting information to “enable him to adequately be apprised of the *1390nature and scope of those accusations against him as guaranteed to him by Article I, Section 11 of the Wyoming Constitution * * *.”11 The record, however, contains no indication that this motion was ever determined by the trial court. In any event, no bill of particulars was ever filed. As a result, the notice to Derksen was sufficient only to the extent that a defense for conduct involving sexual intrusion would be required.
If the offense of taking immodest, immoral or indecent liberties were a lesser included offense of sexual assault in the second degree, the notice burden would have been satisfied by the “necessarily included" language of W.R.Cr.P. 31(c). Selig, 635 P.2d at 793; Brantley, 9 Wyo. at 106, 61 P. at 139-40. In Brantley, this court held that because of the lesser included offense doctrine, “in charging an intent to commit murder in the first degree there is necessarily included a charge of intent to commit murder in the second degree and voluntary manslaughter.” Brantley, 9 Wyo. at 106, 61 P. at 139-40 (emphasis added).
The Brantley decision illustrates an important point about' the lesser included offense doctrine and the multiple punishment component of the double jeopardy clause which has been overlooked in the State’s argument. Wyo. Const, art. 1 § 11. The Brantley court supported its decision by citing the traditional progression of a lesser included offense:
Under our statute murder in the first degree, murder in the second degree, and manslaughter each involves a felonious killing. To constitute the first, it must be done with premeditated malice; the second is a killing with malice, but with the element of premeditation omitted, while in voluntary manslaughter there is an intentional killing, but without any element of malice or premeditation.
Brantley, 9 Wyo. at 106-07, 61 P. at 140. At the time Brantley was decided, Wyoming’s homicide statutes fulfilled the requirement that, “ ‘the elements of the lesser offense are identical to part of the elements of the greater offense * * Selig, 635 P.2d at 790 (quoting Chapman, 615 F.2d at 1299). Therefore, a conviction for assault with intent to commit murder in the second degree was affirmed despite the fact that the charge filed was for assault with intent to commit murder in the first degree. Brantley, 9 Wyo. at 109, 61 P. at 140.
Brantley’s punishment was a sentence for committing the offense of assault with intent to commit murder in the second degree, the lesser offense. If he had been found guilty of the greater offense, assault with intent to commit murder in the first degree, the sentence would have been for that offense. Brantley could not have been sentenced for both the greater and lesser offenses without violating the multiple punishment protection of the double jeopardy clause. Whalen v. United States, 445 U.S. 684, 694, 100 S.Ct. 1432, 1439, 63 L.Ed.2d 715 (1980).
The Wyoming Supreme Court has previously ruled that a defendant convicted of sexual assault in the second degree and taking immodest, immoral or indecent liberties may be sentenced for both offenses. Kallas v. State, 704 P.2d 693, 695 (Wyo.1985). In its ruling, the court specifically recognized that the elements of the offenses are not identical. Our recent decision in Rivera acknowledged, for purposes of sentencing, that a merger of a sexual assault offense and an offense for taking immodest, immoral or indecent liberties may occur when the facts proven at trial establish that the defendant committed only a single criminal act. Rivera, 840 P.2d 933. However, Rivera also approved individual sentences for sexual assault in *1391the first degree and taking immodest, immoral or indecent liberties when individual offenses were committed. Id. If we were to agree with the State’s argument, that the offense of taking immodest, immoral or indecent liberties is a lesser included offense of sexual assault in the second degree, we would have to overrule Kallas and Rivera. Whalen, 445 U.S. at 694, 100 S.Ct. at 1439. The State cannot be urging such discordant results.
Derksen has met his burden of establishing that a substantial right was denied and that material prejudice resulted from a lack of notice. Instructing the jury members that they could convict Derksen of taking immodest, immoral or indecent liberties as a lesser included offense amounted to plain error. It is not necessary to consider the remaining issues on appeal.
IV. CONCLUSION
The demonstration of plain error at trial requires the conviction be reversed to be retried, if the county attorney elects, on a properly charged offense under Wyo.Stat. § 14-3-105.
CARDINE, J., files a specially concurring opinion. THOMAS, J., files a dissenting opinion.. At the time of trial, W.R.Cr.P. 32(c) was in effect. The language of both the present and former rule is identical.
. We acknowledge the unsettled nature of the lesser included offense doctrine in Wyoming. Craney, 798 P.2d at 1205 n. 6 (noting differences in various approaches). However, under any anticipated formulation, the result would be the same.
. The actor in Wyo.Stat. § 6-2-303(a)(v) must be four years older than the victim. The actor in Wyo.Stat. § 14-3-105 may be any age.
. The victim in Wyo.Stat. § 6-2-303(a)(v) must be less than twelve years of age. The victim in Wyo.Stat. § 14-3-105 may be any age under nineteen years.
. The language of the instruction is derived from Sorenson v. State, 604 P.2d 1031, 1034-35 (Wyo.1979) which held Wyo.Stat. § 14-3-105 (1977) was not unconstitutionally vague.
. Wyo.Stat. § 6-2-301(a)(vi) defines sexual contact as "touching, with the intention of sexual arousal, gratification or abuse, of the victim’s intimate parts by the actor, or of the actor’s intimate parts by the victim, or of the clothing covering the immediate area of the victim’s or actor’s intimate parts[.]”
.Colorado’s former offense of taking immodest, immoral or indecent liberties with a child is now incorporated into a sexual assault on a child offense creating a cohesive structure of sexual assault crimes. Colo.Stat. § 18-3-405 (1986 & Cum.Supp.1992).
. U.S. Const, amend. VI provides, in pertinent part, “In all criminal prosecutions, the accused shall enjoy the right * * * to be informed of the nature and cause of the accusation * * *.”
. Wyo. Const, art. 1 § 10 insures, in pertinent part, “In all criminal prosecutions the accused *1389shall have the right * * * to demand the nature and cause of the accusation, to have a copy thereof * * *.”
. Until the entry of the plea, former W.R.Cr.P. 9(c) provided that the state could have amended the information without leave of the court to charge a violation of Wyo.Stat. § 14-3-105 for taking immodest, immoral or indecent liberties with a child. No amendments to the information were filed before the plea was entered. After the plea was entered, the former rule permitted, at the court’s discretion, "an information to be amended at any time before verdict or finding if no additional or different offense is charged and if substantial rights of the defendant have not been prejudiced." W.R.Cr.P. 9(c) (emphasis added). See W.R.Cr.P. 3. The addition of a charge of taking immodest, immoral or indecent liberties after the plea would have been counter to the rule of McInturff, 808 P.2d at 193 since a different offense, involving sexual contact and other conduct, would have been charged.
. Wyo. Const, art. 1 § 11 encompasses the right to protection against double jeopardy by providing: "No person shall be compelled to testify against himself in any criminal case, nor shall any person be twice put in jeopardy for the same offense. If a jury disagree, or if the judgement be arrested after a verdict, or if the judgement be reversed for error in law, the accused shall not be deemed to have been in jeopardy.”