A federal judge hearing a constitutional challenge to a Kansas law requiring doctors, teachers and others to report underage sex between consenting youths said the state presented no credible evidence that underage sex is always harmful. U.S. District Judge J. Thomas Marten stopped short of issuing a decision from the bench, but he repeatedly interrupted Thursday's closing arguments by Assistant Attorney General Steve Alexander to challenge his assertions. "Motives are irrelevant - I want to deal with facts," Marten said. "Where is the clear, credible evidence that underage sex is always injurious? If you tell me because it is illegal...