in the word's of buzz lightyear, Friend is just another word for Loser
Girls ask to be friends because they can not deal with being a jerk. Or at least, not deal with people knowing they are being a jerk. They have a need for approval if not from you, from their friends and family.
I don't really feel bad for the females in this thread that have been annoyed by guys still pursueing them after they get the speech. God forbid someone find you interesting, or place too much importance on you because they are lonely. Do any of you even stop to think how lonely life is for the average American male?