London -- Famous American singer-writer Adam Levine revealed that he has a bad mouth and in order to get rid of this habit he donates $100 every time he swears on the American talent show -- The Voice. "I have a dirty mouth. I curse a lot and I want to try to contain that a little bit. I'll have a little curse jar next to me. Every time we say a bad word, $100 goes to charity. It will help us, it really will. Because we'll end up giving a lot," he said. The Moves Like Jagger hitmaker has earlier also raised money for spreading awareness about prostate and testicular cancer by posing naked in Cosmopolitan magazine. "I spend most of my life naked. In fact, I often have to be told by the people around me that it's inappropriate to be as naked as I am. But I live in California, where it's always warm, so why not?" the singer said.