Gaydar? I never even heard that term until I was, like, 17 years old, and at that point, it seemed pretty silly. There were a couple of guys in school whom I thought might be straight. But, I was later surprised to learn that they were gay. And there were a few guys whom I thought "sounded gay" who dated exclusively girls. I don't put any stock into stereotypes; the only way to know for certain, is to ask someone directly, and that's something I would never do unless I were already close with the person. So, to answer the question: No, I don't believe Gaydar really exists.