Carlos Rivera appeals from a judgment of conviction entered on October 24, 2006, in the United States District Court for the District of Connecticut (Kravitz, J.), following a jury trial at which he was found guilty of charges involving sexual exploita *247 tion of children. Those charges included coercion and enticement to sexual conduct, travel with intent to engage in such conduct, and the possession and production of child pornography. As a recidivist, Rivera was sentenced to a mandatory term of life imprisonment on the conviction for producing child pornography. Two issues presented on appeal (misjoinder of the offenses against the minor named Brian, and sentencing) are controlled by established precedent and are addressed briefly below.
We write primarily to consider the District Court’s jury instruction on the meaning of “lascivious” for purposes of 18 U.S.C. § 2256(2)(A)(v). Rivera contends that his photographs of a naked 16-year old male on a bed do not satisfy the statutory definition.
BACKGROUND
The evidence showed a pattern of predatory conduct. Rivera met boys in Internet chat rooms, exchanged sexually explicit messages and photographs with them, and arranged to meet them for illicit sexual encounters. During one such encounter, Rivera created the photographs that ground his conviction for production of child pornography.
Four of Rivera’s victims testified at trial, as follows in our brief and bowdlerized summary. 1
Brian told Rivera that he was twelve years old and lived in Nebraska. After some months of online chats about sex (including explicit video images of Rivera), Brian disclosed that his family was taking a trip to Washington, D.C. Rivera drove from his Connecticut home, checked into the hotel where Brian and his family were staying, and enticed Brian to his room for sex-posting notes with his screen name on a trail to his room, giving Brian a room-key (which Brian hid from his parents and then returned), confronting Brian in the lobby (with his parents nearby), and leaving his room door ajar. When Brian appeared, they engaged in oral and anal sex. By that time, Brian was thirteen years old.
Garrett told Rivera that he was fifteen years old (in fact, he was fourteen). Rivera engaged Garrett in explicit online chats, and arranged an encounter near their homes in Connecticut. Garrett bicycled to a hotel near his house where Rivera had suggested that they meet. When they were unable to get a room, Garrett declined to accompany Rivera to his house. A week later, they met in the woods outside Garrett’s house, where they had anal sex. Garrett asked Rivera to buy him a paintball gun for his birthday. When Garrett sought to disengage, Rivera threatened to tell all to Garrett’s mother; Garrett threatened to call the police.
David was sixteen years old when he met Rivera online. David agreed to meet Rivera for sex, and Rivera arrived around midnight at David’s home in Massachusetts. David sneaked out while his parents slept and went to a hotel with Rivera. After the two showered together, Rivera took several photographs of David lying naked on the hotel bed. David testified that Rivera “suggested a few positions” and that he “complied.” Six of the photographs were introduced at trial to evidence Rivera’s production of child pornography. After oral and anal sex, Rivera drove David home.
When Michael was sixteen, he and Rivera had online chats about sex and exchanged photographs of themselves, *248 clothed and unclothed. Michael testified that after he refused to meet Rivera for sex, “he blackmailed me and said he was going to send those pictures that I sent him to another student that goes to my school.”
Rivera was captured by the police after Brian’s mother found an incriminating note. A state trooper, posing as Brian, engaged Rivera in an Internet chat about what had transpired between them. When he was arrested, Rivera declined to sign a form attesting that he had waived his Miranda rights; however, he agreed to be interviewed by the authorities for two hours. At trial, the arresting police detective testified that during the interview, Rivera admitted to having had sex with Brian, who he thought “looked young.”
A special agent of the FBI testified to the contents of Rivera’s laptop computer, which included between 2,000 and 3,000 photographs of minors engaged in sexually explicit conduct, including the pictures Rivera took of David and photographs of Garrett and Michael that they had sent him; a chart detailing Rivera’s sexual encounters (which listed both Garrett and Brian); 2 the record of an online chat in which Rivera gloated about having had sex with several boys (including Garrett and Brian); and a template blackmail letter threatening to tell a minor’s parents that their child is gay unless the minor agreed to make a pornographic video with Rivera and to continue having sex with him. 3 The government also introduced into evidence records of the emails and online chats Rivera had exchanged with Brian, Garrett, David and Michael.
The jury convicted Rivera on all five counts: two counts of coercion and enticement, in violation of 18 U.S.C. § 2422(b), one count of travel with intent to engage in illicit sexual conduct, in violation of 18 U.S.C. § 2423(b), one count of production of child pornography, in violation of 18 U.S.C. § 2251(a), and one count of possession of child pornography, in violation of 18 U.S.C. § 2252A (a)(5)(B). In special interrogatories accompanying the verdict on count four (for production of child pornography), the jury identified four of the photographs of David as visual depictions of sexually explicit conduct (a phrase explained in the District Court’s jury charge), and therefore child pornography.
The District Court imposed concurrent sentences of: 480 months’ imprisonment on counts one and two; 480 months’ imprisonment on count three; the mandatory term of life imprisonment on count four; and 240 months’ imprisonment on count five. The District Court also imposed mandatory and discretionary restitution for the victims’ losses, including their psychiatric treatment and care.
DISCUSSION
Rivera argues that his photographs of David do not constitute child pornography, that is, that the evidence was insufficient *249 for a conviction on count four; in the alternative, he contends that the jury was misled by the District Court’s instructions. Rivera also challenges the District Court’s denial of his motion to sever the counts relating to Brian from the counts relating to his other victims. Lastly, Rivera challenges his sentence on constitutional grounds.
I
It is illegal to entice or coerce a minor to engage in “sexually explicit conduct for the purpose of producing any visual depiction of such conduct.” 18 U.S.C. § 2251(a). “[Sjexually explicit conduct” is defined to include the “lascivious exhibition of the genitals or pubic area of any person.” Id. § 2256(2)(A)(v).
The term “lascivious” is not self-defining.
See United States v. Villard,
The leading case is
United States v. Dost,
1) whether the focal point of the visual depiction is on the child’s genitalia or pubic area;
2) whether the setting of the visual depiction is sexually suggestive, i.e., in a place or pose generally associated with sexual activity;
3) whether the child is depicted in an unnatural pose, or in inappropriate attire, considering the age of the child;
4) whether the child is fully or partially clothed, or nude;
5) whether the visual depiction suggests sexual coyness or a willingness to engage in sexual activity;
6) whether the visual depiction is intended or designed to elicit a sexual response in the viewer.
Id.
Here, the District Court charged the jury as follows, using the Dost factors:
The term lascivious exhibition means a depiction which displays or brings to view to attract notice to the genitals or pubic area of minors in order to excite lustfulness or sexual stimulation in the viewer.
Not every exposure of the genitals or pubic area constitutes a lascivious exhibition. In deciding whether a particular depiction constitutes a lascivious exhibition which displays or brings to view to attract notice to the genitals or pubic area of minors in order to excite lustfulness or sexual stimulation in the view, you should consider the following questions. ...
The court then described the Dost factors.
Rivera presses two arguments on appeal: first, that the photos of David taken *250 by Rivera do not fit the parameters of the Dost factors, ie., that the evidence was insufficient to support a conviction under the jury charge that was delivered; and second, that the Dost factors themselves are infirm, and have been criticized by many courts.
A
A defendant challenging the sufficiency of the evidence “bears a heavy burden.”
United States v. Griffith,
A reasonable jury could — and did— find that the four photographs depict the lascivious exhibition of a minor’s genitals. The images all show David lying naked on a hotel room bed, his genitals prominent at or about the center of the frame. Two of the photographs depict David looking directly at the camera: in one, David is lying on his chest, his upper body raised on his elbows, while he looks over his left shoulder toward the camera; in another, David lies on his back, the right side of his body resting on his right elbow.
Although the
Dost
factors are not definitional, they are useful for assessing the sufficiency of evidence, and pose questions that are (at least) germane to the issue of lasciviousness. Here, all four photographs arguably satisfy several
Dost
factors: a bed is “generally associated with sexual activity,”
Dost,
B
“We review
de novo
the propriety of jury instructions.”
United States v. Naiman,
Tellingly, nearly all of the Dost-factor critics have lined up behind an argument that is of no help to Rivera. Their underlying concern is that the factors sweep too narrowly,
i.e.,
that “[t]he standard employed by the district court was
over-generous
to the defendant....”
Wiegand,
Much criticism has focused on the fifth
Dost
factor, which asks “whether the visual depiction suggests sexual coyness or a willingness to engage in sexual activity.”
Dost,
The sixth
Dost
factor has also been criticized. It asks “whether the visual depiction is intended or designed to elicit a sexual response in the viewer.”
Dost,
Is this a subjective or objective standard, and should we be evaluating the response of an average viewer or the specific defendant in this case? Moreover, is the intent to elicit a sexual response analyzed from the perspective of *252 the photograph’s composition, or from extrinsic evidence (such as where the photograph was obtained, who the photographer was, etc.)?
United States v. Amirault,
The Third Circuit has resolved the objection as follows:
We must ... look at the photograph, rather than the viewer. If we were to conclude that the photographs were lascivious merely because [the defendant] found them sexually arousing, we would be engaging in conclusory bootstrapping rather than the task at hand — a legal analysis of the sufficiency of the evidence of lasciviousness.
Villard,
Some of this criticism is mitigated once one distinguishes between the production of child pornography and possession. In
Dost,
the defendants were charged with having
produced
child pornography. It was thus logical for the Ninth Circuit to hold that the pictures were “a lascivious exhibition because the photographer arrayed it to suit his peculiar lust.”
Wiegand,
Similarly, the
Dost
factors are arguably of diminished utility for purposes of Fourth Amendment analysis.
See Hill,
Notwithstanding valid criticisms and cautions about the Dost factors, we see no error in the jury charge given by the District Court.
Congress chose the word “lascivious,” which has to do generally with sexual arousal. Although the statute is not unconstitutionally vague,
see United States v. X-Citement Video, Inc.,
We need not decide whether the Dost factors would govern in every case that touches on child pornography. Among other things, it matters whether production or possession is the charge. But it is no error for a district court to recommend the Dost factors as considerations, making any adaptations or allowances warranted by the facts and charges in a particular case. That said, the jury should not be made to rely on the Dost factors with precision to reach a mathematical result, or to weigh or count them, or to rely on them exclusively.
II
Rivera argues that the District Court erred in denying his motion to sever counts two (enticement of Brian) and three (interstate travel relating to Brian) from counts one (enticement of Garrett), four (production of child pornography depicting David) and five (possession of child pornography). Rivera contends that joinder of these five charges was improper under Federal Rule of Criminal Procedure 8(a), or in the alternative, that the District Court abused its discretion in declining to sever the charges under Rule 14(a).
“Our scrutiny of the district court’s denial of a Rule 8 motion to sever requires a twofold inquiry: whether join-der of the counts was proper, and if not, whether misjoinder was prejudicial to the defendant.”
United States v. Ruiz,
Federal Rule of Criminal Procedure 14(a) provides that “[i]f the joinder of offenses or defendants in an indictment, an information, or a consolidation for trial appears to prejudice a defendant or the government, the court may order separate trials of counts, sever the defendants’ trials, or provide any other relief that justice requires.” Fed.R.Crim.P. 14(a). We review the denial of a motion under this rule for abuse of discretion, and do not reverse “unless the defendant demonstrates that the failure to sever caused him ‘substantial prejudice’ in the form of a ‘miscarriage of justice.’ ”
United States v. Sampson,
The joinder was proper. Counts one, two, three and four share a “general likeness” in terms of the conduct and events alleged: over a four-month period, Rivera targeted Brian, Garrett, Michael, David in Internet chat rooms; exchanged sexually explicit messages and photographs with
*254
them; and enticed them to meet for illicit sexual encounters. During one of those encounters, Rivera took the photographs that form the basis of count four. And some of the same exhibits were used to prove counts one, two and three: the dossiers Rivera maintained of his sexual experiences, which listed Garrett and Brian; and the transcript of an Internet chat in which Rivera said that he had abused five boys, including Garrett and Brian. As to count five (possession of child pornography), we agree with the Eleventh Circuit that “child molestation and child pornography ... plainly represent acts of ‘similar character’ involving the extraordinary mistreatment of children.”
United States v. Hersh,
Rivera fails to demonstrate that he suffered prejudice from the joinder. Rivera posits a prejudicial “spillover” because the government introduced evidence that Rivera had issued threats to some of his victims and suggested (in summation) that Rivera’s photographs of David were lascivious due to Rivera’s general prurient interest in young males. Rivera contends that, in denying his motion, the District Court overlooked the likelihood that the jury would be “profoundly influenced ... by the cumulative effect of evidence relating to distinct offenses in its assessment of whether the government had met its burden of proof on any one charge.” 5
This generalized claim of prejudice is insufficient. The District Court instructed the jury to “consider each count separately and return a separate verdict of guilty or not guilty for each” of them, and that its verdict “must be unanimous as to each charge,” More particularly, Federal Rule of Evidence 414 provides that “[i]n a criminal case in which the defendant is accused of an offense of child molestation, evidence of the defendant’s commission of another offense or offenses of child molestation is admissible, and may be considered for its bearing on any matter to which it is relevant.” Fed.R.Evid. 414(a). The same rule defines “child” as a person below the age of fourteen. Id. 414(d). As a consequence, proof as to counts two and three (relating to Brian, age thirteen) would likely have been admissible as to the three other counts. The Federal Rules of Evidence thus specifically sanction the kind of showing that Rivera says is impermissible and conducive to spillover. The District Court did not violate Rule 8(a) and did not abuse its discretion under Rule 14(a).
Ill
Rivera challenges his sentence as cruel and unusual, in violation of the Eighth Amendment. Since Rivera failed to raise this claim in the District Court, we deem it forfeited.
United States v. Feliciano,
In any event, Rivera’s forfeited constitutional claim is without merit. “The Eighth Amendment ‘forbids only extreme
*255
sentences that are “grossly disproportionate” to the crime.’ ”
United States v. Yousef,
Lastly, Rivera’s Sixth Amendment challenge to his sentence is defeated by Almendarez-Torres
v. United States,
CONCLUSION
For the foregoing reasons, we affirm.
Notes
. Because the victims of Rivera’s crimes were minors, only their first names were given at trial.
. The chart gathered data under the following headers: name, age, year, virgin (Y or N), and "fucked” (number of times). The government also introduced a handwritten version of the same chart.
. The template, saved under file name "BlackMail.doc,” stated:
Hey _ I decided to blackmail you. U WILL have sex with ME in real LIFE, again, and you WILL let me make a PORN video with you. IF you don't do as I say and let me do what I want, I'll write to your PARENTS at this address_And I will let them know that you are GAY. I will also send them info about your online "activities” "chats” and will also tell them where they can find more info/ NOTE: IF you banish [sic] from online without giving in to my demands I will still do what I just said above. U can’t hide, U will be the loser.
. "Given to or expressing lust; lecherous” or "[ejxciting sexual desires; salacious.” The American Heritage Dictionary of the English Language (4th ed.2006).
. In the District Court, Rivera asserted that joinder would prejudice his right to testify on certain counts but not on others. He has forfeited that argument on appeal, relying instead on the broader concern expressed in
United States v. Werner,
