McGIVERIN, Justice.
This case involves several issues that arose during the trial of a personal injury action by a motor vehicle passenger against the driver. and owner resulting from a one-vehicle accident. We affirm on defendants’ appeal and dismiss plaintiff’s cross-appeal.
On June 30, 1981, plaintiff Douglas Alan Campbell was a passenger in a car owned by defendant Carla Marie Hundley and driven by defendant Tammy Sue Van Roek-el, age 17, when it struck a utility pole in Clive causing injury to his nose.
Plaintiff brought an action against both defendants for his personal injuries. Van Roekel admitted she was intoxicated at the time and that her negligence in the operation of the car was the proximate cause of the accident. Plaintiff sought recovery for compensatory or actual damages on a negligence theory against both defendants. He also asked for punitive damages against Van Roekel. Defendants alleged that plaintiff was negligent in a manner that was a proximate cause of his injury and damages.
The portion of the case asking for compensatory damages and involving the parties’ alleged negligence was submitted to the jury on a comparative negligence basis. See Goetzman v. Wichern, 327 N.W.2d 742 (Iowa 1982). In answering questions in a special verdict, the jury found the plaintiff sustained actual damages from the accident of $20,000, and that negligence of both plaintiff and defendants were proximate causes of plaintiff’s injury and damage with five percent of the combined negligence attributable to plaintiff and ninety-five percent attributable to defendants.
In response to other instructions and a separate question, the jury awarded punitive damages of $2,000 to plaintiff against Van Roekel.
The trial court entered judgment in favor of plaintiff against both defendants for compensatory damages of $19,000, after reducing the $20,000 jury verdict for actual damages by five percent. Judgment against Hundley was based solely on her statutory liability under Iowa Code section 321.493 (1983) as owner of the car. Judgment was also entered for plaintiff against Van Roekel for the full amount of the punitive damage award of $2,000.
Defendants appeal, contending the trial court erred in:
1) not properly instructing the jury concerning negligence on the part of plaintiff;
2) not allowing evidence as to plaintiff’s scholastic standing and post-accident driving record;
3) allowing cross-examination of Van Roekel concerning payment of her medical insurance by her parents, and Hundley’s awareness of Van Roekel’s previous drinking and driving activities; and
4) submitting the issue of permanence of plaintiff’s injuries to the jury.
On cross-appeal, plaintiff asserts the court should have also submitted to the jury, as an additional basis of liability, an issue of negligent entrustment of the car by the owner, Hundley, to the driver, Van Roekel. At the close of the evidence the court directed a verdict in defendant Hund-ley’s favor on the issue of negligent en-trustment.
I. Instruction on passenger's negligence. Defendants alleged and asserted that negligence on the part of plaintiff was a proximate cause of his injuries. The claimed negligence was that plaintiff placed himself in a position of jeopardy by riding with the intoxicated driver, Van Roekel, and thereby assumed the risk of injury to himself.
Accordingly, the trial court in instruction 5 told the jury that it could find plaintiff negligent if it found that he assumed the [409]*409risk of riding with the intoxicated driver, and that the amount of his recovery shall be reduced by the percentage that his negligence bears to the total negligence that caused the damages. The court instructed, inter alia, that defendants must prove the “plaintiff was aware of the intoxication [of Van Roekel] and of the danger to himself from it.”
In response to questions in the special verdict, the jury found plaintiff negligent under this instruction and that such negligence was a proximate cause of his injury. The jury further found that plaintiff’s negligence was five percent of the combined negligence of plaintiff and defendants that caused plaintiffs injury or damage.
Defendants contend the court erred in connection with instruction 5. We do not approve of the instruction but we find that no reversible error occurred.
A. Defendants first contend the court should have given an instruction as requested by defendants concerning plaintiffs negligence based on the duty of a vehicle passenger which utilized an objective, reasonable person standard. The requested instruction in part would allow a finding that plaintiff was negligent in entering and remaining in the vehicle “when he knew or in the exercise of reasonable care should have known that defendant Van Roekel’s ability to drive was impaired.”
Therefore, defendants asked for a “reasonable person,” or objective standard, to apply on whether plaintiff knew or in the exercise of reasonable care should have known that Van Roekel’s ability to drive was impaired and yet he entered and remained in the vehicle.
The court’s instruction 5 placed a burden on defendants to prove that plaintiff knew that Van Roekel was intoxicated while driving and that he was aware of the danger to himself from it. Even under this subjective standard, the jury found plaintiff negligent. Therefore, defendants were not harmed by the instruction given.
We, however, do not approve of the instruction given by the court which attempted in the intoxicated defendant driver-plaintiff passenger situation to combine an assumption of risk defense with negligence on the part of plaintiff. We believe that was unnecessary for the following reasons.
Previously in this state, Iowa Code section 321.494 (1979), the guest statute, provided that a motor vehicle guest passenger could not recover against the driver unless the passenger’s damage was caused as a result of the driver being intoxicated or reckless while operating the vehicle. In an action by the passenger, assumption of risk by the passenger of the driver’s intoxicated condition in the operation of the vehicle was a complete defense.
Then in Bierkamp v. Rogers, 293 N.W.2d 577 (Iowa 1980), we struck section 321.494 by declaring it unconstitutional as violative of the equal protection clause of the Iowa constitution.
Thereafter, a passenger could bring an action for his injuries resulting from the driver’s negligence and the driver could allege and attempt to show the passenger was contributorily negligent. Such is the situation now. We stated in Rosenau v. City of Estherville, 199 N.W.2d 125, 133 (Iowa 1972), that assumption of risk in its secondary meaning was abolished as a separate defense in all cases in which contributory negligence was available as a defense. The term and defense of “assumption of risk” is no longer appropriate in the passenger-driver situation. The driver can, however, allege and show the passenger is negligent under an objective “reasonable person” standard in a manner that was a proximate cause of the passenger’s damage.
The next stage occurred when we adopted comparative negligence in Goetzman v. Wichern,
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McGIVERIN, Justice.
This case involves several issues that arose during the trial of a personal injury action by a motor vehicle passenger against the driver. and owner resulting from a one-vehicle accident. We affirm on defendants’ appeal and dismiss plaintiff’s cross-appeal.
On June 30, 1981, plaintiff Douglas Alan Campbell was a passenger in a car owned by defendant Carla Marie Hundley and driven by defendant Tammy Sue Van Roek-el, age 17, when it struck a utility pole in Clive causing injury to his nose.
Plaintiff brought an action against both defendants for his personal injuries. Van Roekel admitted she was intoxicated at the time and that her negligence in the operation of the car was the proximate cause of the accident. Plaintiff sought recovery for compensatory or actual damages on a negligence theory against both defendants. He also asked for punitive damages against Van Roekel. Defendants alleged that plaintiff was negligent in a manner that was a proximate cause of his injury and damages.
The portion of the case asking for compensatory damages and involving the parties’ alleged negligence was submitted to the jury on a comparative negligence basis. See Goetzman v. Wichern, 327 N.W.2d 742 (Iowa 1982). In answering questions in a special verdict, the jury found the plaintiff sustained actual damages from the accident of $20,000, and that negligence of both plaintiff and defendants were proximate causes of plaintiff’s injury and damage with five percent of the combined negligence attributable to plaintiff and ninety-five percent attributable to defendants.
In response to other instructions and a separate question, the jury awarded punitive damages of $2,000 to plaintiff against Van Roekel.
The trial court entered judgment in favor of plaintiff against both defendants for compensatory damages of $19,000, after reducing the $20,000 jury verdict for actual damages by five percent. Judgment against Hundley was based solely on her statutory liability under Iowa Code section 321.493 (1983) as owner of the car. Judgment was also entered for plaintiff against Van Roekel for the full amount of the punitive damage award of $2,000.
Defendants appeal, contending the trial court erred in:
1) not properly instructing the jury concerning negligence on the part of plaintiff;
2) not allowing evidence as to plaintiff’s scholastic standing and post-accident driving record;
3) allowing cross-examination of Van Roekel concerning payment of her medical insurance by her parents, and Hundley’s awareness of Van Roekel’s previous drinking and driving activities; and
4) submitting the issue of permanence of plaintiff’s injuries to the jury.
On cross-appeal, plaintiff asserts the court should have also submitted to the jury, as an additional basis of liability, an issue of negligent entrustment of the car by the owner, Hundley, to the driver, Van Roekel. At the close of the evidence the court directed a verdict in defendant Hund-ley’s favor on the issue of negligent en-trustment.
I. Instruction on passenger's negligence. Defendants alleged and asserted that negligence on the part of plaintiff was a proximate cause of his injuries. The claimed negligence was that plaintiff placed himself in a position of jeopardy by riding with the intoxicated driver, Van Roekel, and thereby assumed the risk of injury to himself.
Accordingly, the trial court in instruction 5 told the jury that it could find plaintiff negligent if it found that he assumed the [409]*409risk of riding with the intoxicated driver, and that the amount of his recovery shall be reduced by the percentage that his negligence bears to the total negligence that caused the damages. The court instructed, inter alia, that defendants must prove the “plaintiff was aware of the intoxication [of Van Roekel] and of the danger to himself from it.”
In response to questions in the special verdict, the jury found plaintiff negligent under this instruction and that such negligence was a proximate cause of his injury. The jury further found that plaintiff’s negligence was five percent of the combined negligence of plaintiff and defendants that caused plaintiffs injury or damage.
Defendants contend the court erred in connection with instruction 5. We do not approve of the instruction but we find that no reversible error occurred.
A. Defendants first contend the court should have given an instruction as requested by defendants concerning plaintiffs negligence based on the duty of a vehicle passenger which utilized an objective, reasonable person standard. The requested instruction in part would allow a finding that plaintiff was negligent in entering and remaining in the vehicle “when he knew or in the exercise of reasonable care should have known that defendant Van Roekel’s ability to drive was impaired.”
Therefore, defendants asked for a “reasonable person,” or objective standard, to apply on whether plaintiff knew or in the exercise of reasonable care should have known that Van Roekel’s ability to drive was impaired and yet he entered and remained in the vehicle.
The court’s instruction 5 placed a burden on defendants to prove that plaintiff knew that Van Roekel was intoxicated while driving and that he was aware of the danger to himself from it. Even under this subjective standard, the jury found plaintiff negligent. Therefore, defendants were not harmed by the instruction given.
We, however, do not approve of the instruction given by the court which attempted in the intoxicated defendant driver-plaintiff passenger situation to combine an assumption of risk defense with negligence on the part of plaintiff. We believe that was unnecessary for the following reasons.
Previously in this state, Iowa Code section 321.494 (1979), the guest statute, provided that a motor vehicle guest passenger could not recover against the driver unless the passenger’s damage was caused as a result of the driver being intoxicated or reckless while operating the vehicle. In an action by the passenger, assumption of risk by the passenger of the driver’s intoxicated condition in the operation of the vehicle was a complete defense.
Then in Bierkamp v. Rogers, 293 N.W.2d 577 (Iowa 1980), we struck section 321.494 by declaring it unconstitutional as violative of the equal protection clause of the Iowa constitution.
Thereafter, a passenger could bring an action for his injuries resulting from the driver’s negligence and the driver could allege and attempt to show the passenger was contributorily negligent. Such is the situation now. We stated in Rosenau v. City of Estherville, 199 N.W.2d 125, 133 (Iowa 1972), that assumption of risk in its secondary meaning was abolished as a separate defense in all cases in which contributory negligence was available as a defense. The term and defense of “assumption of risk” is no longer appropriate in the passenger-driver situation. The driver can, however, allege and show the passenger is negligent under an objective “reasonable person” standard in a manner that was a proximate cause of the passenger’s damage.
The next stage occurred when we adopted comparative negligence in Goetzman v. Wichern, 327 N.W.2d 742 (Iowa 1982). When contributory negligence is urged as a defense, that case requires a recovery for the plaintiff to be reduced by the percentage of the plaintiff’s own negligence that proximately caused the plaintiff’s damage.
[410]*410We do not believe the change in the contributory negligence defense in Goetz-man should affect the holding in Rosenau eliminating assumption of risk in its secondary meaning in negligence cases. We do not decide in this case whether assumption of risk should continue to be a complete defense in other situations.
This case was tried after Goetz-man. The court should have instructed the jury in terms of negligence on the part of plaintiff under the usual reasonable person or objective standard without reference to assumption of risk terminology or strictly subjective standards. However, as noted previously, defendants suffered no harm from the improper instruction because the jury found plaintiff five percent negligent notwithstanding the use of a subjective standard in the instruction.
B. Defendants next contend the court erred in instructing the jury on “gross negligence,” “recklessness,” and “wantonness” because such terms are not consistent with a pure theory of comparative negligence. Defendants’ argument, however, fails to mention that such instruction was addressed to the issue of punitive damages only and not to the underlying claim of negligence and actual damages. We note that the use of such terms in the court’s instruction was proper and necessary for a claim for punitive damages. See Sebastian v. Wood, 246 Iowa 94, 66 N.W.2d 841 (1954). We have indicated that the operation of a motor vehicle by a drunken person on a public highway in violation of a statute intended to protect others is itself equivalent to gross and culpable negligence. See id. at 106, 66 N.W.2d at 848; see also Nichols v. Hocke, 297 N.W.2d 205, 205 (Iowa 1980) (“Under Iowa law exemplary damages may be recovered against one who causes injury by operating a motor vehicle while intoxicated.”)
C. Defendants further contend that assumption of risk is a complete defense to a claim for punitive damages. Defendants’ argument is misplaced, however, for two reasons. First, there is no legal basis under our past cases for finding a separate defense to a claim for punitive damages. Punitive damages are merely incidental to the main cause of action. Sebastian v. Wood, 246 Iowa at 100, 66 N.W.2d at 844. Defendants cannot assert the defense of assumption of risk as to punitive damages when such defense is not applicable to the underlying cause of action from which the claim for punitive damages is derived. See division I-A above.
Secondly, the great weight of the jurisdictions that have adopted the comparative negligence doctrine, and that have considered whether that doctrine requires the reduction of punitive damages by the percentage of plaintiff’s negligence, have refused to so reduce the punitive damage award. Amoco Pipeline Co. v. Montgomery, 487 F.Supp. 1268 (W.D.Okl.1980); Tampa Electric Co. v. Stone & Webster Engineering Corp., 367 F.Supp. 27 (M.D.Fla.1973); Shahrokhfar v. State Farm Mutual Automobile Insurance Co., 634 P.2d 653 (Mont.1981); Wangen v. Ford Motor Co., 97 Wis.2d 260, 294 N.W.2d 437 (1980). Contra Pedernales Electric Cooperative, Inc. v. Schulz, 583 S.W.2d 882 (Tex.Civ.App.1979) (allowed the reduction of a punitive damage award by the percentage of plaintiff’s negligence). Preceding authority cited in Annot., 27 A.L.R. 4th 318 (1984); Annot., 10 A.L.R. 4th 946, 955-57 (1981). See also 31 Drake L.Rev. 709, 786-89 (1982) (recommendation that punitive damage awards not be reduced by percentage of plaintiff’s negligence).
Because in Iowa assumption of risk is considered in its'“secondary meaning” to be an expression of plaintiff’s "contributory negligence, Rosenau, 199 N.W.2d at 131, the rule in the above cited cases from other jurisdictions would apply equally to a claimed defense of assumption of risk. Thus, assumption of risk is not a defense to punitive damages.
The rationale behind this rule is that comparative negligence is a method of providing compensation to the plaintiff in proportion to the relative fault of the [411]*411parties, whereas the purpose of punitive damages is to punish the defendant for his grossly negligent, wanton, willful or reckless misconduct. Shahrokhfar, 634 P.2d at 658; Wangen v. Ford Motor Co., 97 Wis.2d at 276, 294 N.W.2d at 446 n. 7.
We conclude that assumption of risk, which was not a defense to punitive damages before we adopted comparative negligence in Goetzman, should not be a defense to punitive damages after Goetzman either.
The trial court was correct in not regarding negligence or assumption of risk as a complete or partial defense to plaintiffs punitive damage claim. Accordingly, the court properly entered judgment for plaintiff for the full amount of the punitive damage jury verdict.
Defendants’ only defense to the claim for punitive damages was to refute it by showing that Van Roekel’s driving, while intoxicated, was not a reckless or grossly negligent action. In other words, the core of the issue would be whether defendant’s intoxication and actions amounted to “recklessness” and whether the evidence would support such a finding. However, defendants have not assigned specific error on this basis but only on their more vague assertions that an instruction on recklessness is not consistent with pure comparative negligence and that assumption of risk should be deemed a complete defense to a claim for punitive damages.
We find no merit to the assignment defendants did raise on appeal.
II. Limiting scope of cross-examination of plaintiff Defendants also argue that the trial court deprived them of effective cross-examination of plaintiff by sustaining a relevancy objection as to an offer of proof concerning plaintiff’s academic performance and post-accident driving record. Ordinarily the scope of cross-examination is within the trial court’s discretion. We reverse only if there has been an abuse of discretion by the trial court and then only if it appears that prejudice resulted. Avery v. Harms Implement Co., 270 N.W.2d 646, 649 (Iowa 1978).
We conclude the trial court properly exercised its discretion in refusing to permit defendants to cross-examine plaintiff in regard to his academic performance and post-accident driving record. Defendants were not prejudiced by the court’s ruling because such evidence was not relevant to the issues before the court.
Plaintiff did not plead or request damages for loss of future earnings or future earning capacity. His academic record, therefore, was not relevant to the issue of damages and thus should, .not have been exposed at trial.
Defendants further contend that they should have been permitted to question plaintiff about his arrest and guilty plea on a charge of driving while under the influence of alcohol which occurred several months after the operation on his nose. Defendants argue that such information was properly within the scope of cross-examination because plaintiff testified on direct exam that as a result of the accident and operation he has been afraid to ride as a passenger in the front seat of a car driven by another person. We do not find an abuse of discretion by the trial court in refusing this inquiry because plaintiff never mentioned on direct that he was afraid to drive but only that he was apprehensive about riding in the front seat of a car driven by someone else. The fact that after the accident and surgery he subsequently was operating a motor vehicle under the influence of alcohol is not necessarily relevant to his alleged fear of riding with others.
III. Other evidentiary issues. Defendants also contend the court erred in allowing plaintiff to inquire into matters concerning defendant Van Roekel’s medical insurance and her prior driving record and drinking habits.
A. Insurance. Plaintiff did not expose the existence of any liability insurance of defendant Van Roekel to the jury but merely brought out that she was cover[412]*412ed by her parent’s medical insurance and that her parents paid the premiums on such policy. This was offered to show that Van Roekel was not emancipated from her parents, who were parties at trial but not on this appeal. We find no substance in defendants’ reasoning that “the jury could easily infer the existence of other insurance, including liability insurance,” from the fact that she was covered by medical insurance. We conclude that such an inference is sufficiently tenuous so as to preclude any prejudice to defendants and, therefore, the failure to prevent such inquiry did not amount to an abuse of discretion by the trial court.
B. Prior driving record and drinking habits. The court did not allow the introduction of Van Roekel’s official Iowa Department of Transportation driving record. Defendants’ objection, rather, is to the fact that the court permitted plaintiff to question defendant Hundley in regard to her personal knowledge of Van Roekel’s driving record and drinking habits. This testimony came in on the issue of Hund-ley’s alleged negligent entrustment of her automobile to Van Roekel. Such inquiry as to Hundley’s personal knowledge of Van Roekel’s prior driving record and drinking habits was proper at that stage of the trial because such information is the gravamen of a negligent entrustment cause of action. See Beardsley v. Ostrander, 254 Iowa 356, 118 N.W.2d 61 (1962); Krausnick v. Haegg Roofing Co., 236 Iowa 985, 20 N.W.2d 432 (1945). Accordingly, the trial court did not abuse its discretion, in permitting such inquiry.
IV. Submission of permanent injury to jury. Defendants’ final contention is that the court erred in submitting the issue of plaintiff’s permanent injury to the jury. They argue that there was insufficient evidence of permanent injury to warrant such submission. The record, however, reveals ample evidence from the medical files and medical testimony that plaintiff sustained a fractured nose in the accident and that he was left with a deviated septum and nasal obstruction, even after corrective surgery, which makes breathing difficult. We find no error in the court’s submitting to the jury the issue of permanency of plaintiff's injuries.
We have considered all of defendants arguments, even though not specifically addressed, and either find them without merit or unnecessary to our disposition of the appeal.
V. Cross-appeal. We need not consider the merits of plaintiff’s cross-appeal concerning the court’s failure to instruct the jury on the issue of negligent entrustment in view of our disposition of defendants’ appeal and plaintiff’s statement in his brief that “only in the event of a reversal and a remand on Ms. Van Roekel’s appeal should this issue be considered by the Court.”
Having found no reversible error, the case is affirmed with plaintiffs cross-appeal dismissed.
AFFIRMED ON APPEAL; CROSS-APPEAL DISMISSED.
All Justices concur except UHLEN-HOPP, J., and SCHULTZ, J., who dissent in separate opinions, and WOLLE, J., who joins both dissents.