The key signal is brief repeated eye contact. A quick scan of the body of another male is a real give away. Turning around and looking at another male is a very blatant clue. A gay man in a public space looks more alert. He keeps track of where the other males are. A straight male is more zoned out and stolid looking, not reacting to his environment. He is not scanning. His attention might be drawn by a nearby female. A gay male is watching for other gays anywhere within a block.
The New York Times claims there is a correlation between being gay and left handed and having the ring and index fingers the same length.
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