How to understand that you like a guy, a man. Signs, advice, psychology

How to find out if you like the opposite sex? Signs, recommendations, psychology. A representative of the stronger sex is in love, although he hides his own feelings? Find out about the feelings of an adult man will be easier, so ka doubtful that a self-sufficient person will hide his interest. And, of course, if you really like him, he will try to win your attention with all his might.