Lawyers defending Prop 8 and the Defense of Marriage Act have come up with a really good argument for why the gays shouldn’t be able to get married: they think too much before they have babies.

Marriage should be limited to unions of a man and a woman because they alone can “produce unplanned and unintended offspring,” opponents of gay marriage have told the Supreme Court.

By contrast, when same-sex couples decide to have children, “substantial advance planning is required,” said Paul D. Clement, a lawyer for House Republicans.