Gay activist Dan Savage is urging Herman Cain to choose to be gay.

Savage is the founder of the It Gets Better Project, the online collection of videos from everyday folks, celebrities, politicians and athletes that encourages troubled gay, lesbian, bisexual and transgender youth to hang in there, because life gets better.

During an appearance Wednesday night on CNN's Piers Morgan Tonight, Cain reiterated that he believes being gay is a choice, then suggested that it could “wash off.”

Writing at the Slog, the blog of Seattle weekly alternative The Stranger, Savage announced that he had mailed Cain a written proposition.

“If being gay is a choice, show us the proof. Choose it. Choose to be gay yourself. Show America how that's done, Herman, show us how a man can choose to be gay. Suck my dick, Herman. Name the time and the place and I'll bring my dick and a camera crew and you can suck me off and win the argument.”

Savage added that Cain was insulting gay and straight people.

“If homosexuality is a choice, then so is heterosexuality,” he wrote separately. “Herman Cain believes that heterosexuality is something a heterosexual can decide to walk away from, like an underwater house or a lousy meal. Straight people should get angry when they hear a straight person making this argument.”