Women don't take risk.... especially for men.
From calling to asking out to sexual conversations and sexual advances, few women take risk.
Because she is constantly being judged in society. If she start sexual conversation, you might think she is slut or you might think she wants you. Because of that, she expects the man to take all the risk.
Now, this isn't to say she never take risk. Women do make advance like calling and asking men out, but the times they do, they are simply getting desperate or tired of waiting.
You job, is to take the risk.
With risk comes failure and success. Let's you want to kiss her, you may get rejected. Let's say you want to advance to sexual conversation, you may offend her.