The definition of marriage is plastic. Just like heterosexual marriage is no better or worse than homosexual marriage, marriage between two consenting adults is not inherently more or less “correct” than marriage among three (or four, or six) consenting adults. Though polygamists are a minority—a tiny minority, in fact—freedom has no value unless it extends to even the smallest and most marginalized groups among us. So let’s fight for marriage equality until it extends to every same-sex couple in the United States—and then let’s keep fighting. We’re not done yet.

Recently, Tony Perkins of the Family Research Council reintroduced a tired refrain: Legalized gay marriage could lead to other legal forms of marriage disaster, such as polygamy. Rick Santorum, Bill O’Reilly, and other social conservatives have made similar claims. It’s hardly a new prediction—we’ve been hearing it for years. Gay marriage is a slippery slope! A gateway drug! If we legalize it, then what’s next? Legalized polygamy?

We can only hope.

Yes, really. While the Supreme Court and the rest of us are all focused on the human right of marriage equality, let’s not forget that the fight doesn’t end with same-sex marriage. We need to legalize polygamy, too. Legalized polygamy in the United States is the constitutional, feminist, and sex-positive choice. More importantly, it would actually help protect, empower, and strengthen women, children, and families.

For decades, the prevailing logic has been that polygamy hurts women and children. That makes sense, since in contemporary American practice that is often the case. In many Fundamentalist Latter-day Saints  polygamous communities, for example, women and underage girls are forced into polygamous unions against their will. Some boys, who represent the surplus of males, are brutally thrown out of their homes and driven into homelessness and poverty at very young ages. All of these stories are tragic, and the criminals involved should be prosecuted to the fullest extent of the law. (That goes without saying, I hope.)

But legalizing consensual adult polygamy wouldn’t legalize rape or child abuse. In fact, it would make those crimes easier to combat.

Right now, all polygamous families, including the healthy, responsible ones, are driven into hiding (notwithstanding the openly polygamous Brown family on TLC’sSister Wives, that is). In the resulting isolation, crime and abuse can flourish unimpeded. Children in polygamous communities are taught to fear the police and are not likely to report an abusive neighbor if they suspect their own parents might be caught up in a subsequent criminal investigation. In a United States with legalized polygamy, responsible plural families could emerge from the shadows—making it easier for authorities to zero in on the criminals who remain there.

Many people argue that there is no such thing as a “healthy, responsible” polygamous family, particularly for the children born into one. “Children are harmed because they are often set in perennial rivalry with other children and mothers for the affection and attention of the family patriarch,” argued John Witte Jr. in the Washington Post. “Men with lots of children and wives are spread too thin,” agreed Libby Copeland in Slate. The earnestness of these arguments is touching but idealistic.

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