OPINION
Cochran, J.,
delivered the opinion of the Court
in which Meyers, Womack, Johnson and Alcala, JJ., joined.
A jury found appellant, Donald Aekins, guilty of three counts of sexual assault. The court of appeals held that his convictions for both contacting and penetrating the adult victim’s sexual organ with his mouth violated his right against multiple punishments for the same offense because the contact and penetration were based on the same act. We granted the State Prosecuting Attorney’s petition for discretionary review1 to clarify that (1) when a single exposure or contact offense is “incident to and subsumed by” a penetration offense, the offenses are the “same” for double-jeopardy purposes, and (2) the Texas Legislature has not manifested its intent to allow multiple punishments for those “same” offenses, so (3) multiple convictions for those “same” offenses violate double-jeopardy principles. We conclude that the court of appeals properly vacated the conviction for the “contact” sexual-assault count, and we affirm its judgment.2
I.
Appellant and his wife, Amanda, first met Jessica Parnell (a pseudonym), at a downtown Austin Salvation Army shelter in October of 2010. Amanda and Jessica became friends at the shelter and helped each other with their children. But Jessica was uncomfortable around appellant because he was flirtatious, he kissed her neck, and he “always had a lot of perverted comments.” Jessica finally told Amanda that if appellant did not stop hitting on her, they could no longer be friends.
[273]*273The Aekins family later left the Salvation Army shelter and moved into a house, while Jessica and her children moved to another shelter. Jessica started babysitting the Aekins’s two children, based on Amanda’s promise that appellant would not be there when she came over.
Amanda asked Jessica if she would babysit her children on February 2, 2012, because Amanda had school and appellant would be out job hunting. Jessica agreed, and Amanda picked her up early that morning and brought her back to the Ae-kins’s house.
When Amanda and Jessica arrived, appellant was lying in bed with his infant son. Amanda told Jessica that he was “fixing to get up and get dressed and leave.” Instead, appellant stayed in bed after Amanda left for school. Jessica was with her two children and the Aekins’s oldest child in the front room when appellant called her into the bedroom and asked her to bottle-feed the baby.
Jessica propped herself up against the back of the bed to feed the baby, who was lying next to her with his bottle. Appellant got up, closed the door, “pushed stuff in front of it,” and then came back over to Jessica’s side of the bed. He climbed on top of her and started to take her pants off. “He was telling me he just wanted to taste me.... I was trying to push him off me, but he just kept telling me to feed the baby and it just scared me, like I really didn’t know what to do.” Appellant performed oral sex on Jessica against her will, and he also put his fingers inside her vagina against her will.
A few minutes later, Jessica’s daughter knocked on the bedroom door, so Jessica got up, got away, left the house, and went next door to a neighbor’s home. She text-ed Amanda and told her that “she wasn’t going to watch the .kids anymore because Donald had just sexually assaulted her.” Then she called the police. Appellant, meanwhile, came over to the neighbor’s home and yelled, “[Ajin’t nobody going to believe you anyway.”
Appellant was charged in a three-count indictment:
Count 1: causing the penetration of Jessica Parnell’s female sexual organ by the defendant’s finger,
Count 2: causing the penetration of Jessica Parnell’s female sexual organ by the defendant’s mouth and/or tongue, and
Count 3: causing Jessica Parnell’s female sexual organ to contact defendant’s mouth.
The jury convicted appellant of all three counts-two penetration offenses and one contact offense — and sentenced him to 55 years’ imprisonment on each count, to run concurrently.
On appeal, appellant argued that his conviction under Count 3 violated the Double Jeopardy Clause because contacting and penetrating Jessica Parnell’s sexual organ with his mouth constituted a single criminal act. The court of appeals agreed. Citing Patterson v. State,3 and Barnes v. State,4 the court concluded that appellant’s conviction for sexual assault by contact was barred by double-jeopardy principles because it was based on the same act for which he was convicted of sexual assault [274]*274by penetration.5 The court of appeals vacated the trial court’s judgment for sexual assault under Count 3.6
The correctness of the appellate court’s holding depends on the validity of what has become known as the Patterson “incident to and subsumed by” doctrine. We reaffirm this doctrine (which, in some jurisdictions is called “the merger doctrine”) and reiterate that it is well grounded in the Fifth Amendment guarantee against double jeopardy.7
II.
The Fifth Amendment provides, “No person shall ... be subject for the same offence to be twice put in jeopardy of life or limb[.]” In North Carolina v. Pearce,8 the Supreme Court stated that the guarantee against double jeopardy consists of three separate constitutional protections: first, it protects against a second prosecution for the same offense after acquittal; second, it protects against a second prosecution for the same offense after conviction; and third, it protects against multiple punishments for the same offense.9 This case involves a multiple-punishments issue.
A multiple-punishments double-jeopardy violation may arise either in the context of lesser-included offenses (when the same conduct is punished under both a greater and a lesser-included statutory offense) or when the same criminal act is punished under two distinct statutory provisions, but the legislature intended only one punishment.10
The first step “in determining the troublesome question of what constitutes the ‘same offense’” 11 is to apply the two different Blockburger12 tests. The second test, “which focuses upon the statutory language creating the criminal offense,” is the better known.13 Under that second aspect of Blockburger,
The applicable rule is that, where the same act or transaction constitutes a violation of two distinct statutory provisions, the test to be applied to determine whether there are two offenses or only one, is whether each provision requires proof of a fact which the other does not.14
To decide if conviction on multiple counts stemming from a single criminal act is constitutionally permitted, we compare the elements of the two offenses to determine if each requires proof of an element that the other does not. ■ “If so, the statutory offense is presumably not the same and both offenses generally may be prosecuted.” 15
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OPINION
Cochran, J.,
delivered the opinion of the Court
in which Meyers, Womack, Johnson and Alcala, JJ., joined.
A jury found appellant, Donald Aekins, guilty of three counts of sexual assault. The court of appeals held that his convictions for both contacting and penetrating the adult victim’s sexual organ with his mouth violated his right against multiple punishments for the same offense because the contact and penetration were based on the same act. We granted the State Prosecuting Attorney’s petition for discretionary review1 to clarify that (1) when a single exposure or contact offense is “incident to and subsumed by” a penetration offense, the offenses are the “same” for double-jeopardy purposes, and (2) the Texas Legislature has not manifested its intent to allow multiple punishments for those “same” offenses, so (3) multiple convictions for those “same” offenses violate double-jeopardy principles. We conclude that the court of appeals properly vacated the conviction for the “contact” sexual-assault count, and we affirm its judgment.2
I.
Appellant and his wife, Amanda, first met Jessica Parnell (a pseudonym), at a downtown Austin Salvation Army shelter in October of 2010. Amanda and Jessica became friends at the shelter and helped each other with their children. But Jessica was uncomfortable around appellant because he was flirtatious, he kissed her neck, and he “always had a lot of perverted comments.” Jessica finally told Amanda that if appellant did not stop hitting on her, they could no longer be friends.
[273]*273The Aekins family later left the Salvation Army shelter and moved into a house, while Jessica and her children moved to another shelter. Jessica started babysitting the Aekins’s two children, based on Amanda’s promise that appellant would not be there when she came over.
Amanda asked Jessica if she would babysit her children on February 2, 2012, because Amanda had school and appellant would be out job hunting. Jessica agreed, and Amanda picked her up early that morning and brought her back to the Ae-kins’s house.
When Amanda and Jessica arrived, appellant was lying in bed with his infant son. Amanda told Jessica that he was “fixing to get up and get dressed and leave.” Instead, appellant stayed in bed after Amanda left for school. Jessica was with her two children and the Aekins’s oldest child in the front room when appellant called her into the bedroom and asked her to bottle-feed the baby.
Jessica propped herself up against the back of the bed to feed the baby, who was lying next to her with his bottle. Appellant got up, closed the door, “pushed stuff in front of it,” and then came back over to Jessica’s side of the bed. He climbed on top of her and started to take her pants off. “He was telling me he just wanted to taste me.... I was trying to push him off me, but he just kept telling me to feed the baby and it just scared me, like I really didn’t know what to do.” Appellant performed oral sex on Jessica against her will, and he also put his fingers inside her vagina against her will.
A few minutes later, Jessica’s daughter knocked on the bedroom door, so Jessica got up, got away, left the house, and went next door to a neighbor’s home. She text-ed Amanda and told her that “she wasn’t going to watch the .kids anymore because Donald had just sexually assaulted her.” Then she called the police. Appellant, meanwhile, came over to the neighbor’s home and yelled, “[Ajin’t nobody going to believe you anyway.”
Appellant was charged in a three-count indictment:
Count 1: causing the penetration of Jessica Parnell’s female sexual organ by the defendant’s finger,
Count 2: causing the penetration of Jessica Parnell’s female sexual organ by the defendant’s mouth and/or tongue, and
Count 3: causing Jessica Parnell’s female sexual organ to contact defendant’s mouth.
The jury convicted appellant of all three counts-two penetration offenses and one contact offense — and sentenced him to 55 years’ imprisonment on each count, to run concurrently.
On appeal, appellant argued that his conviction under Count 3 violated the Double Jeopardy Clause because contacting and penetrating Jessica Parnell’s sexual organ with his mouth constituted a single criminal act. The court of appeals agreed. Citing Patterson v. State,3 and Barnes v. State,4 the court concluded that appellant’s conviction for sexual assault by contact was barred by double-jeopardy principles because it was based on the same act for which he was convicted of sexual assault [274]*274by penetration.5 The court of appeals vacated the trial court’s judgment for sexual assault under Count 3.6
The correctness of the appellate court’s holding depends on the validity of what has become known as the Patterson “incident to and subsumed by” doctrine. We reaffirm this doctrine (which, in some jurisdictions is called “the merger doctrine”) and reiterate that it is well grounded in the Fifth Amendment guarantee against double jeopardy.7
II.
The Fifth Amendment provides, “No person shall ... be subject for the same offence to be twice put in jeopardy of life or limb[.]” In North Carolina v. Pearce,8 the Supreme Court stated that the guarantee against double jeopardy consists of three separate constitutional protections: first, it protects against a second prosecution for the same offense after acquittal; second, it protects against a second prosecution for the same offense after conviction; and third, it protects against multiple punishments for the same offense.9 This case involves a multiple-punishments issue.
A multiple-punishments double-jeopardy violation may arise either in the context of lesser-included offenses (when the same conduct is punished under both a greater and a lesser-included statutory offense) or when the same criminal act is punished under two distinct statutory provisions, but the legislature intended only one punishment.10
The first step “in determining the troublesome question of what constitutes the ‘same offense’” 11 is to apply the two different Blockburger12 tests. The second test, “which focuses upon the statutory language creating the criminal offense,” is the better known.13 Under that second aspect of Blockburger,
The applicable rule is that, where the same act or transaction constitutes a violation of two distinct statutory provisions, the test to be applied to determine whether there are two offenses or only one, is whether each provision requires proof of a fact which the other does not.14
To decide if conviction on multiple counts stemming from a single criminal act is constitutionally permitted, we compare the elements of the two offenses to determine if each requires proof of an element that the other does not. ■ “If so, the statutory offense is presumably not the same and both offenses generally may be prosecuted.” 15
The first, less famous, Blockbur-ger test asks whether each criminal act is a [275]*275separate and distinct one, separated by time.16 If the offense is a single contin-tiousact, with a single impulse, in which several different statutory provisions are necessarily violated along that continuum, the offenses merge together. This is variously called “the merger doctrine,”17 “the single impulse doctrine,”18 or, here in Texas, “the doctrine of subsumed acts.”19 If more than one statutory offense is necessarily committed by that single criminal act and impulse, then the offenses merge and the defendant may be punished only once. This “single impulse” aspect of Blockburger is United States Supreme Court law, not some peculiar doctrine thought up by Texas judges. We are not permitted to ignore or denigrate it. As a lower court, we are bound by Supreme Court reasoning on federal constitutional issues. Although one could argue that this aspect of Blockburger is confusing or complicated, other state courts have not found it so.20 This well-established Supreme [276]*276Court doctrine is, of course, wholly unrelated to the discredited “carving doctrine” which was properly jettisoned in Ex parte McWilliams.21
The Blockburger facts exemplify the two separate tests. There, a druggist was convicted of three counts of selling morphine improperly to the same buyer.22 He made one sale on Monday and another sale on Tuesday. The morphine was improperly sold on both days because it was not in its original tax-stamped package,23 and the morphine sale on Tuesday was also not made pursuant to a written order of the purchaser.24 The druggist argued that the morphine sales to the same person on two days constituted a single offense and that the Tuesday sale, which violated two separate statutes — improper packaging and without a written order — was just one act; it was one sale and therefore could be punished only once. The druggist wanted his three convictions reduced to one.
The Supreme Court upheld all three convictions. The first Blockburger test was whether the two separate morphine sales on two separate occasions to the same customer were two offenses or one.25 The Court stated that the distinction between the two separate sales in this case “and an offense continuous in its character is well settled,” noting that “‘when the impulse is single, but one indictment lies, no matter how long the action may continue.’ ”26 The Court explained, “In the present case, the first transaction, resulting in a sale, had come to an end. The next sale was not the result of the original impulse, but of a fresh one-that is to say, of a new bargain.”27 This was unlike [277]*277“continuous crimes,” which are necessarily committed over a period of time and may involve separate acts that are incidental to, or “part and parcel” of, the single completed offense.28
The Supreme Court — applying the second test — then rejected the druggist’s argument that the Tuesday sale, which violated two separate statutes, was really one offense. The Court explained that the Narcotics Act was “not aimed at sales of the forbidden drugs qua sales” but at drugs sales in violation of the many regulations governing them, including the tax-stamp regulation and the written-order regulation.29 Thus, “both sections were violated by the one sale” and the druggist committed two separate offenses at the same instant.
In sum, Blockburger addresses two multiple-punishment issues; the “continuous action vs. separate and distinct acts” issue and the “one act violates separate distinct statutes” issue. But the Supreme Court has said that, for purposes of multiple-punishment analysis, the two Blockburger tests are just tools — not the be all, end all, of statutory construction.30 Sometimes two offenses that are the “same” may both be punished31 sometimes two “different” offenses may noiboth be punished.32 It all depends on the legislature’s intent.33
In a line of cases addressing double-jeopardy and jury-unanimity issues in sexual-assault cases, we have concluded that the Texas Legislature’s intent is to [278]*278punish each discrete assault. Separate criminal acts committed during a single sexual encounter may be punished separately, but a criminal act (such as exposure or contact) that is committed as' part of a continuing sexual assault that results in one complete, ultimate act of penetration34 may not be punished along with that complete, ultimate act. Steps along the way to one rape merge into the completed act.
A. Multiple Sexual Acts May Be Punished Separately.
A person who commits more than one sexual act against the same person may be convicted and punished for each separate and discrete act, even if those acts were committed in close temporal proximity. The key is that one act ends before another act begins.35 The defendant might touch a child’s breast; then he touches her genitals. Two separate acts, two separate impulses, two separate crimes.
This is true for acts violating not only different statutes,36 but different subsections of a single statute,37 and even different discretely prohibited acts within the same subsections.38 Indecency with a Child, for instance, criminalizes indecency by exposure in one subsection and indecency by contact in another, but two punishments are possible because they require two distinct acts.39 Breaking down that [279]*279statute even further, Indecency with a Child criminalizes three separate contact acts — touching of the (1) anus, (2) breast, or (3) genitals.40 A person who touches a child’s anus, breast, and genitals may be convicted of three offenses. Likewise, Sexual Assault under subsection 22.011(a)(1)(A) criminalizes two separate acts — penetrating by any means (1) the anus, or (2) the sexual organ. Jury unanimity is required for these distinct acts, but it is not required for the different means of committing a single distinct act (e.g., penetrating the anus with the defendant’s finger, mouth, or sexual organ).41 Thus, for example, the State might charge the defendant with a single count of aggravated sexual assault for penetrating a child’s sexual organ and allege several different means — penis, finger, mouth, or other object — if there was one sexual assault, but the child is uncertain of what the defendant used to penetrate. What matters is the sexual assault upon the victim, not what the defendant used to commit that discrete assault.
B. Acts That Are Subsumed or Merged into the Ultimate Act May Not Be Punished Separately.
A double-jeopardy violation occurs if one is convicted or punished for two offenses that are the same both in law and in fact. Penetration without exposure is next to impossible. Penetration without contact is impossible. A single sexual act of penile penetration almost always consists of exposing the penis en route to contacting the vagina (or anus or mouth) with the penis, en route to penetration of the same with the penis. That one continuing act, the result of a single impulse, may violate three separate Penal Code provisions, but in Patterson, we held that the Legislature intended only one conviction for that one completed sexual assault.42 This means that multiple convictions for one complete, ultimate sexual assault violate the Double Jeopardy Clause.43 Patterson was not decided on double-jeopardy grounds, but in Garfias v. State,44 we concluded that the result in Patterson would be the same under a constitutional analysis, stating
[280]*280even if we had decided the constitutional issue, it is clear that the elements of the offenses as charged against the defendant were the same under the Blockbur-ger test. Under the cognate-pleadings approach, when the facts necessary to prove one offense are included within the proof necessary to establish another, the offenses are considered the “same” for double-jeopardy purposes, and multiple punishments are barred unless the Legislature has clearly and specifically authorized them. In Patterson, the defendant’s exposure — proof necessary for the indecency conviction — was included within the proof necessary to establish the aggravated sexual assault by penetration.45
The Pattersonrule is akin to “the merger rule” in other jurisdictions. Some jurisdictions require merger by statute and provide broader protection than the Double Jeopardy Clause. Whatever the source or scope of the rule, it has one root purpose: to prevent Double Jeopardy Clause violations.46 The merger rule prevents “cumulative punishment of a defendant for the same criminal act where his conduct can be- construed to constitute two statutory offenses, when, in substance and effect, only one offense has been committed.”47
The merger rule can be stated another way: Where two crimes are such that the one cannot be committed without necessarily committing the other, then they stand in the relationship of greater and lesser offenses, and the defendant cannot be convicted or punished for both.48 For example, in Georgia, a child molestation based on touching the child’s vagina with a hand merged into aggravated sexual battery based on penetrating her vagina with a finger.49 And in Alaska, second-degree sexual contact that is merely preparatory to, or coincident with, penetration merges with the first degree penetration offense.50 Conversely, in Massachusetts, an indecent contact that was “separate from and not incidental to the act of penetration did not merge with the crime of [281]*281rape to constitute bút a single offense[.]”51
In short, in Texas, as in many other jurisdictions, a defendant may not be convicted for a completed sexual assault by penetration and also for conduct (such as exposure or contact) that is demonstrably and inextricably part of that single sexual .assault. With these guiding principles in mind, we turn to the double-jeopardy issue in this case.
III.
The offenses in Counts 2 and 3 are the “same” under the law. Applying our cognate-pleadings version of the second Blockburger test, the facts necessary to prove the indicted Section 22.011(a)(1)(C) offense (contact of Jessica Parnell’s sexual organ by defendant’s mouth) are included within the proof necessary to establish the indicted Section 22.011(a)(1)(A) offense (penetration of Jessica Parnell’s sexual organ by defendant’s mouth). Since the offenses are considered the “same” for double-jeopardy purposes, multiple punishments are barred unless the Legislature has clearly and specifically authorized them. As discussed above, this Court has already determined — by looking at the Ervin factors across a multitude of cases — that the Legislature has not manifested an intent to authorize “stop-action” prosecutions (and therefore multiple punishments) for a single complete act of sexual assault.52
The offenses are also the “same” under the first Blockburger test. As the court of appeals stated, “The State presented no evidence the contact and penetration of appellant’s tongue constituted separate and distinct acts. Rather, Parnell’s testimony supports appellant’s contention the sexual assault consisted of a single incident that occurred within the span of minutes.” 53
The SPA asks how to determine whether an instance of conduct is a single act or multiple acts. This is an issue other courts have grappled with. In Nevada, the court asks, has there been “a hyper-technical division of what was essentially a single act”?54 The District of Columbia Court of Appeals has stated,
[282]*282As with other Fifth Amendment double jeopardy claims, to determine whether the defendant’s conduct was a single act or distinct acts we employ the “fresh impulse” or “fork-in-the-road” test. If at the scene of the crime the defendant can be said to have realized that he has come to a fork in the road, and nevertheless decides to invade a different interest, then his successive intentions make him subject to cumulative punishment[.]55
We have used the “fresh impulse” test in the context of drug offenses. In Lopez v. State,56 we held that an offer to sell drugs and the possession of the drugs to complete that specific sale is one single offense because the steps in this single drug transaction were all “the result of the original impulse,” and therefore each step was not a “new bargain.”57
These tests are simply common-sense propositions that reject “a sterile literalism which loses sight of the [constitutional] forest for the [statutory] trees.”58 A complete, ultimate sexual assault is one act, though it may involve other discrete lesser acts (none is a new “fork in the road” or a “fresh impulse”) along the way towards its completion. A rape is one act from beginning to end; an incident of oral sex is one act from beginning to end.
If the victim says Dangerous Dan raped her, then forced oral sex, then raped her again, then forced oral sex again — there are four criminal convictions possible.59 All four of those complete, ultimate acts may have also contained lesser discrete criminal acts along the way toward completion (multiple contacts and multiple discrete acts of penetration per rape), but those merge with the completed, ultimate sexual assault. On the other hand, an act of masturbation is an exposure complete in itself and a “fresh impulse” from an exposure incident to a contact or penetration.60 An indecent contact that is not simply preparatory to an act of penetration is itself a complete, ultimate act-the result of a fresh impulse. Likewise, separate acts of penetration with different instruments (say, with a sex toy and with a penis61) [283]*283constitute two distinct ultimate acts. This is why appellant may be punished for the two penetration counts in this case (penetration by finger and penetration by mouth), even though they are proscribed by the same subsection of sexual assault— Texas Penal Code § 22.011(a)(1)(A) — without offending the Double Jeopardy Clause.
We agree with the court of appeals that the jury in this case could not have found two separate acts of the defendant’s mouth contacting and penetrating Jessica’s sexual organ. Two convictions, based on a hyper-technical division of what was essentially a single continuous act, are barred under the Double Jeopardy Clause. We affirm the judgment of the court of appeals.
Keller, P.J., filed a concurring opinion in which Price, Keasler and Hervey, JJ., joined.
Keasler, J., filed a concurring opinion in which Keller, P.J., and Hervey, J., joined.