A second lawsuit challenging Indiana's ban on gay marriage was filed on Monday.

Lambda Legal filed the lawsuit in federal court on behalf of three lesbian couples who would like to marry in Indiana but are unable due to state law.

“Same-sex couples and their families in the Hoosier state are vulnerable every day that they are denied the freedom to marry,” Paul Castillo, staff attorney for Lambda Legal, said in a statement. “Many families are helped and no one is hurt when same-sex couples are treated fairly by their government. Even if couples travel out of state to marry they will still be denied any respect by the state of Indiana and there are many important federal benefits, such as Family Medical Leave, that will be denied because those benefits are based on whether or not the home state respects the marriage.”

Plaintiff couples include Rae Baskin, 60, and Ester Fuller, 78, of Whitestown; Bonne Everly, 56, and Linda Judkins, 57, of Chesterton; and Dawn Lynn Carver, 41, and Pamela Eanes, 50, of Munster. The couples have been together 24, 13 and 17 years, respectively.

A similar lawsuit involving four couples was filed last week.

(Related: Indiana's ban on gay marriage ban challenged.)

The cases come just weeks after Indiana lawmakers altered the language of a proposed constitutional amendment seeking to limit marriage to a heterosexual union, keeping the amendment from reaching voters this November.