This was were I was failing when I first started (not to long ago). I found that girls give their number out fairly easily as well as give kisses (most have been drinking anyways. If I spend less that three minutes with a girl, I only have a 50/50 % chance they will even answer my calls. While anything above three minutes I have closer to a 95% rate.
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Recommended reading list.
Double Your Dating by DD
(This will work on your inner game)
http://www.freewebs.com/xfman/
(This will work on your outer game)