Justices of the Iowa Supreme Court today grilled attorneys on two sides of a case that seeks to bring marriage equality to Iowa.

According to this report on the hearing from Des Moines Register, questions from the justices to the advocates focused on different aspects of what are generally called "slippery slope" arguments -- assertions that recognizing the right of gay and lesbian couples to marry would lead to unintended consequences.

Oral arguments today pitted the Polk County attorney's office against the couples, financed by the national gay and lesbian rights group Lambda Legal.

An attorney for six same-sex Iowa couples insisted that allowing gay marriage would not open the door to polygamous marriages, despite challenges from several Iowa Supreme Court justices. ...

[Assistant Polk County Attorney Roger] Kuhle said that state support of same-sex marriage would teach future generations that marriage is no longer about procreation, one of its historic tenets.

"One could easily argue, and we do, that fostering same-sex marriage will harm the institution of marriage as we know it," Kuhle said. "It's not going to happen tomorrow. We're not going to see any changes tomorrow, next week, next year, in our generation. But you've got to look to the future."