Why does it seem like girls always want to be friends?

I realized that girls tend to be a little more 'naive' than guys when they get to know someone from the opposite sex. A guy can go towards them, strike a conversation, show interest in her, make a lot of eye contact and ask for her phone number and she will still think they are friends. I find this really weird that most girls think about friendship first in those cases.

I DO have very good friends who are girls, but two of them I had a crush on and the third one I was never attracted to but she started talking to me and I realized we had great conversations. But other than that, men always think about something more than friends when they make the first step towards a girl and want to strike conversations for no reason. And yet girls seem to think that this is friendship.

I really don't get why girls, in general, seem to think about being friends first and guys, on the other hand, seem to think about getting in a relationship with them. We always assume that if a girl shows a bit of interest then it must mean she is interested in something more than friendship or else why would she be so eager to make friends with a random guy? It doesn't really make sense to me. Anybody noticed that or agrees with me?
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Do you think that girls value the importance of friendship more than guys do?
Why does it seem like girls always want to be friends?
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