Some people have it easy but others don't, like myself. Some can spot a gay guy miles away, others can't even if they slapped them across the face, but don't get down about it, because it does get disappointing. There are a few obvious mannerisms every guy should know. The "Flit", the "Lisp", the "Hip action", and the ever popular, the "limp wrist". Aside from the basic stereotypes I just mentioned picking out a date can be tough. The biggest piece of advice I can give is to pay attention to the person, but don't stalk them that's the biggest mistake one can make when trying to find a date the first few times. They pay attention to the point of stalking and that can get creepy and disappointing. A second piece of advice is try to be friends with them and get to know them. Don't get so set on starting a relationship with a person if you don't know if they are gay or not. Start as friends and leave the dating subject out of the convo until you feel that you should mention it. Aside from that, asking is the easiest way to find out and the answer is usually right.....(some people are in denial and there is no point in forcing the issue with these people, trust me =]) If asking is not your way of dealing with things then I hope this advice helped, if not keep looking and don't give up and get disappointed. There is someone waiting for you out there

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Good Luck!
Kevin