The state is justified in recognizing only real marriages as marriages. People who cannot enter marriages so understood for, say, psychological reasons are not wronged by the state, even when they did not choose and cannot control the factors that keep them single—which is true, after all, of many people who remain single despite their best efforts to find a mate. Any legal system that distinguishes marriage from other, nonmarital forms of association, romantic or not, will justly exclude some kinds of union from recognition. So before we can conclude that some marriage policy violates the Equal Protection Clause, 12or any other moral or constitutional principle, we have to determine what marriage actually is and why it should be recognized legally in the first place. That will establish which criteria (like kinship status) are relevant, and which (like race) are irrelevant to a policy that aims to recognize real marriages. So it will establish when, if ever, it is a marriage that is being denied legal recognition, and when it is something else that is being excluded. As a result, in deciding whether to recognize, say, polyamorous unions, revisionists would not have to figure out first whether the desire for such relationships is natural or unchanging; what the economic effects of not recognizing polyamory would be; whether nonrecognition stigmatizes polyamorous partners and their children; or whether nonrecognition violates their right to the equal protection of the law. With respect to the last question, it is exactly the other way around: Figuring out what marriage is would tell us whether equality requires generally treating polyamorous relationships just as we do monogamous ones—that is, as marriages. Third, there is no general right to marry the person you love, if this means a right to have any type of relationship that you desire recognized as marriage. There is only a presumptive right not to be prevented from forming a real marriage wherever one is possible. And, again, the state cannot choose or change the essence of real marriage; so in radically reinventing legal marriage, the state would obscure a moral reality.