It is quite simple to know if a gay man is interested or not. It is in the way that he looks at you, it is in the gestures that he makes, it is in the way that he talks, and it is in his actions.

To recognize the simple gestures, the simple peeks, the simple winks you have to be paying attention. As with any courtships, the issue is that the other party is oblivious to what is going on around them.