Relationships: the secret advantage all men possess

I often hear it pointed out that women have many advantages over men when it comes to relationships. However, there is one area in which men have all the power.

How to tell if she’s interested

Recently I learned that men, unlike women, can apparently never really tell whether a member of the opposite sex is interested in them or not. As such, I've developed a very simple and testable method for men to tell if a woman desires him.