Doll, Kitten, and Brynn Young are married in Massachusetts. Or at least that’s what they say. It’s not clear how their three-way union is legal, as Massachusetts does not recognize polygamy, although it does recognize same-sex marriage.

The older women, Brynn and Doll, had been together for two-and-a-half years before they found Kitten on a threesome website, the New York Post reported last week. They all fell in love and decided to get married.

The threesome swear the marriage is real. One claimed to have tears in her eyes when she saw the other women being escorted down the aisle.

The youngest of the trio, Kitten, is also pregnant with the “throuple’s” first child through an anonymous sperm donor.

Yep, you read that right: throuple. (Three + couple= throuple.) It’s already defined in Urban Dictionary. Even National Review has taken note of the term a few times in the past, including a reference to a Brazilian notary’s decision to recognize a triad marriage.

To answer some of the glaring questions: The Youngs sleep in the same bed. They have sex in pairs as well as together. They all took Brynn’s last name, because she brings in most of the money.

The throuple will soon prove to be a hindrance to the same-sex marriage movement rather than a victory. This is exactly what the most die-hard conservatives warned about when same-sex marriage became a discussion. In fact, one can already see the effects of the throuple.

Some conservative websites are already running arguments that support these women in the abstract sense that their marital arrangement follows logically from more popular efforts to redefine marriage. PJ Media’s Tatler posted an article entitled, “And now, the throuple: Why shouldn’t these three ladies get married if they want?” Lifesitenews.com asked whether the throuple is “The next marriage redefinition?”

These lesbians indicate that same-sex marriage is turning marriage into a joke. Soon “the polygamy movement” (which will no doubt have a catchy name) will be making the following argument: “Why can’t three consenting adults get married if they are in love?”

It will make a great reality show on TLC, but it also raises an important question. Same-sex marriage advocates have convinced a growing percentage of Americans that two-person gay marriage is acceptable. Now they’ll need explain why three- or five-person gay (or other) marriage is not.

— Christine Sisto is an editorial assistant at National Review.