Robin Mayer, co-respondent in the divorce proceedings of the petitioner, David G. Blanchflower, and the respondent, Sian E. Blanchflower, challenges an order of the Lebanon Family Division (Cyr, J.) denying her motion to dismiss the petitioner’s amended ground for divorce of adultery. See RSA 458:7, II (Supp. 2002). We accepted this matter as an interlocutory appeal under Supreme Court Rule 8, and now reverse and remand.
The record supports the following facts. The petitioner filed for divorce from the respondent on grounds of irreconcilable differences. He *227subsequently moved to amend the petition to assert the fault ground of adultery under RSA 458:7, II. Specifically, the petitioner alleged that the respondent has been involved in a “continuing adulterous affair” with the co-respondent, a woman, resulting in the irremediable breakdown of the parties’ marriage. The co-respondent sought to dismiss the amended petition, contending that a homosexual relationship between two people, one of whom is married, does not constitute adultery under RSA 458:7, II. The trial court disagreed, and the co-respondent brought this appeal.
Before addressing the merits, we note this appeal is not about the status of homosexual relationships in our society or the formal recognition of homosexual unions. The narrow question before us is whether a homosexual sexual relationship between a married person and another constitutes adultery within the moaning of RSA 458:7, II.
RSA 458:7 provides, in part: “A divorce from the bonds of matrimony shall be decreed in favor of the innocent party for any of the following causes: ... II. Adultery of either party.” The statute does not define adultery. Id. Accordingly, we must discern its meaning according to our rules of statutory construction.
“In matters of statutory interpretation, this court is the final arbiter of the intent of the legislature as expressed in the words of a statute considered as a whole.” Wegner v. Prudential Prop. & Cas. Ins. Co., 148 N.H. 107, 108 (2002) (quotation omitted). We first look to the language of the statute itself and, where terms are not defined therein, “we ascribe to them their plain and ordinary meanings.” Id.
The plain and ordinary meaning of adultery is “voluntary sexual intercourse between a married man and someone other than his wife or between a married woman and someone other than her husband.” Webster’s Third New International Dictionary 30 (unabridged ed. 1961). Although the definition does not specifically state that the “someone” with whom one commits adultery must be of the opposite gender, it does require sexual intercourse.
The plain and ordinary meaning of sexual intercourse is “sexual connection esp. between humans: COITUS, COPULATION.” Webster’s Third New International Dictionary 2082. Coitus is defined to require “insertion of the penis in the vagina[j,” Webster’s THIRD New International Dictionary 441, which clearly can only take place between persons of the opposite gender.
We also note that “[a] law means what it meant to its framers and its mere repassage does not alter that meaning.” Appeal of Naswa Motor Inn, 144 N.H. 89, 91 (1999) (quotation omitted). The statutory compilation in which the provision now codified as RSA 458:7 first appeared is the *228Revised Statutes of 1842. See RS 148:3 (1842). No definition of adultery was contained in that statute. See id. Our cases from that approximate time period, however, support the inference that adultery meant intercourse. See Adams v. Adams, 20 N.H. 299, 301 (1850); Burns v. Burns, 68 N.H. 33, 34 (1894).
Cases from this period also indicate that adultery as a ground for divorce was equated with the crime of adultery and was alleged as such in libels for divorce. See, e.g., Sheafe v. Sheafe, 24 N.H. 564, 564 (1852); White v. White, 45 N.H. 121, 121 (1863). Although the criminal adultery statute in the 1842 compilation also did not define adultery, see RS 219:1 (1842), roughly contemporaneous case law is instructive: “Adultery is committed whenever there is an intercourse from which spurious issue may arise ____” State v. Wallace, 9 N.H. 515, 517 (1838); see also State v. Taylor, 58 N.H. 331, 331 (1878) (same). As “spurious issue” can only arise from intercourse between a man and a woman, criminal adultery could only be committed with a person of the opposite gender.
We note that the current criminal adultery statute still requires sexual intercourse: “A person is guilty of a class B misdemeanor if, being a married person, he engages in sexual intercourse with another not his spouse or, being unmarried, engages in sexual intercourse with another known by him to be married.” RSA 645:3 (1996). Based upon the foregoing, we conclude that adultery under RSA 458:7, II does not include homosexual relationships.
We reject the petitioner’s argument that an interpretation of adultery that excludes homosexual conduct subjects homosexuals and heterosexuals to unequal treatment, “contrary to New Hampshire’s public policy of equality and prohibition of discrimination based on sex and sexual orientation.” Homosexuals and heterosexuals engaging in the same acts are treated the same because our interpretation of the term “adultery” excludes all non-coital sex acts, whether between persons of the same or opposite gender. The only distinction is that persons of the same gender cannot, by definition, engage in the one act that constitutes adultery under the statute.
The petitioner also argues that “[p]ublic policy would be well served by applying the same law to a cheating spouse, whether the promiscuous spouse chooses a paramour of the same sex or the opposite sex.” This argument is tied to the premise, as argued by the petitioner, that “[t]he purpose underlying [the adultery] fault ground is based upon the fundamental concept of marital loyalty and public policy’s disfavor of one spouse’s violation of the marriage contract with another.”
*229We have not, however, seen any sueh purpose expressed by the legislature. As noted above, the concept of adultery was premised upon a specific act. To include in that concept other acts of a sexual nature, whether between heterosexuals or homosexuals, would change beyond recognition this well-established ground for divorce and likely lead to countless new marital cases alleging adultery, for strategic purposes. In any event, “it is not the function of the judiciary to provide for present needs by an extension of past legislation.” Naswa Motor Inn, 144 N.H. at 92 (quotation and brackets omitted). Similarly, “we will not undertake the extraordinary step of creating legislation where none exists. Rather, matters of public policy are reserved for the legislature.” In the Matter of Plaisted & Plaisted, 149 N.H. 522, 526 (2003).
The dissent defines adultery not as a specific act of intercourse, but as “extramarital intimate sexual activity with another.” This standard would permit a hundred different judges and masters to decide just what individual acts are so sexually intimate as to meet the definition. The dilemma faced by Justice Stewart and his fellow justices applying their personal standards to the issue of pornography in movies demonstrates the value of a clear objective definition of adultery in marital cases. See Jacobellis v. Ohio, 378 U.S. 184 (1964).
We are also unpersuaded by the dissent’s contention that “[i]t is improbable that the legislature intended to require an innocent spouse in a divorce action to prove the specific intimate sexual acts in which the guilty spouse engaged.” Citing Jeanson v. Jeanson, 96 N.H. 308, 309 (1950), the dissent notes that adultery usually has no eyewitnesses and therefore “ordinarily must be proved by circumstantial evidence.” While this is true, it does not support the dissent’s point. For over a hundred and fifty years judges, lawyers and clients have understood that adultery meant intercourse as we have defined it. It is an act determined not by the subjective test of an individual justice but by an objective determination based upon the facts. What must be proved to establish adultery and what evidence may be used to prove it are separate issues. Adultery cases have always required proof of the specific sexual act engaged in, namely, sexual intercourse. That circumstantial evidence may be used to establish the act does not negate or undermine the requirement of proof that the act actually occurred. “Jeanson is no authority for the proposition that evidence justifying nothing more than suspicion will suffice to prove the adultery suspected.” Yergeau v. Yergeau, 132 N.H. 659, 663 (1990).
Finally the petitioner contends that this appeal is procedurally improper because it was based upon the trial court’s denial of an interlocutory appeal and lacked the trial court’s signature. On January 24, 2003, we *230invited the parties to file memoranda addressing whether the trial court’s denial of the co-respondent’s motion for interlocutory appeal should be reversed and the case accepted for appellate review. The petitioner submitted a memorandum, as did the other parties. After considering the parties’ submissions, we issued an order waiving the formal requirements of New Hampshire Supreme Court Rule 8 and treating the corespondent’s motion to dismiss amended petition as an interlocutory appeal pursuant to Rule 8. We have thus already ruled on the issue the petitioner now asserts and we decline to reconsider it.
Reversed and remanded.
DALIANIS and Duggan, JJ., concurred; BROCK, C.J., and BRODERICK, J., dissented.