I think the question was more about how you go about becoming friends with a member of the opposite sex. Of course you would ask the girl out yourself once you had decided she was someone you were interested in dating. (After becoming friends.)
group settings are always best. like get a group togther & ask the one you're interested if she would like to join your group to whatever outing you're on. Its the best way to get to know someone and it takes any pressure of of you and the girl.
That was what I was trying to say, and it's what I've been doing. I'm glad other people, (and especially the sisters), agree with me. :)
Ahh - well, even so, asking a friend to ask someone else to do something is truly immature. Plus, when you hang around a girl more and talk to her more, even if it's just as friends, she'll know if you've got a twinge of interest in her. So I agree that a group setting is best.