I'm going to have to agree with the majority herre and say yes. That's like assuming a man in China is Chinese. He may not be, and threr are a lot of people in China who are definately not Chinese, but you've got very, very good odds they are. Even if the person is gay, they'd probably treat the assumtion with an ammused chuckle and "oh, ha I'm gay". Hell people have thought I'm gay before, and that's basically how I react.