Thailand's prime minister is trying to ferret out a government minister who allegedly had a penis enlargement operation, saying news of it is affecting the Cabinet's reputation, a news report said on Wednesday. "Who did it? Tell me," Prime Minister Thaksin Shinawatra asked his ministers at Tuesday's Cabinet meeting, triggering a round of banter and causing some to squirm in their chairs, The Nation newspaper said. Last week, a woman -- being sued for defamation by a clinic after she claimed it gave her