Minnesota Vikings punter Chris Kluwe explains his gay rights advocacy in an interview with gay glossy Out.

The 30-year-old Kluwe has become an outspoken supporter of marriage equality and an ardent opponent of a proposed amendment to the Minnesota Constitution defining marriage as a heterosexual union.

Kluwe, who is raising two children with his wife Isabel, has recorded several ads for Minnesotans for Equality, a group working to defeat the marriage ban. In one, he describes the measure as anti-American and anti-freedom.

He also came to the aid of Baltimore Ravens linebacker Brendon Ayanbadejo, whose gay marriage advocacy had come under attack from Maryland Delegate Emmett C. Burns Jr.

In an interview with gay glossy Out, Kluwe explained what motivates him to speak out on gay rights, and, as athletes are want to do, he posed for photos shirtless.

“It's all about the Golden Rule,” Kluwe said. “Treat other people as you want to be treated. It's that simple. It's something that needs to be spoken about, and it's something I can do while fulfilling my job as a football player.”

(Related: Ravens' Matt Birk appears in ad supporting Minnesota's gay marriage ban.)