Most Helpful Girl
Because we've been socially conditioned to think that it's a man's responsibility to ask women out. I know it's silly but if a guy doesn't ask me out then I automatically assume that he's just not attracted to me, which may or may not be true.
Most Helpful Guy
Girls don't want to ask guys out because they want to be the ones who are being pursued! Not the ones pursuing! I know many girls who have liked a certain guy soooo much but never once considered asking him out because they want to make sure that they are lovely enough for him to actively pursue her!
Also, some might not ask because they want to test his manliness! It takes guts to just ask a girl out without knowing wether or not she will turn him down cold! If he does, it shows he can really lead in a relationship! If not, he wouldn't be worth asking out!