Some women may feel uncomfortable that you're initiating a kiss.
When you're at the end of your conversation and she's about to leave.Go in for a cheek kiss, you should be holding each of her arms with your hands.This will melt her little heart just enough to escalate further, as her barriers go down.Remember that women watch way too many crappy love movies, so this is one way of getting her on your side quickly.Physical touching comes a little later, when you can see she's ready for more.
Why would you expect a girl to want to have sex with you, if you're just a normal guy? You need to plant those seeds of sexual thoughts in her mind.
Ok, so we've spoken about the verbal sexual seduction queues. All you need to do is slow things down (your movements, eyes, gestures, words etc) then look into her left eye, hold this for around 3 seconds, then look into her right eye for the same time.
Finally look directly at her lips for about 2 seconds and repeat the process again, getting closer to her face as you do this.
Meaning, removing her from her friends (cock-blocks) and any noisty areas, where you can't talk properly.
Make sure it's a quiet area, which is comfortable, so she doesn't get concerned. This means you need to look directly into her eyes, place your hands around her waist and slowly pull her to you. When this happens you will see her pupils dilate and she'll begin to slow her movements down.
Duing your interaction with her, you need to place a few thought provoking nuggets of filth into her mind, so she gradually begins to think about sleeping with you.