Prime Minister John Key has defended downing several cups of beer during a drinking game yesterday, saying it was not "too crazy" and in the spirit of fun.

Mr Key was challenged to a game of beer pong at the Big Gay Out in Auckland's Pt Chevalier yesterday. He agreed, and had to down several cups of beer in the process.

They came by the thousands in body paint, drag costumes and even rainbow-coloured onesies to celebrate their sexuality at New Zealand's largest gay pride event.

On TVNZ's Breakfast this morning Mr Key defended his decision to take part in the game.

Asked about the link between games like beer pong and irresponsible drinking, Mr Key said: "I've heard those sorts of things before. I mean look, it was a bit of fun. It was about that much beer [about an inch] in the cups, so it wasn't anything too crazy."

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Mr Key added it was "in the spirit of a bit of fun".

He said he would "definitely win" a game of beer pong against Labour leader David Cunliffe.

"Wouldn't be any doubt about it."

Prime Minister John Key arrived to a mixed reception at the Big Gay Out, wearing a yellow polo shirt, with some voices shouting "we want Lorde, not you" as he made his way to the stage.