Timing is everything

Nobody can tell you when to make the first move. It's just something you have to figure out for yourself. But, if you're even the slightest bit tuned in to your girl, you'll know when the time is right.

Here are some tips to help you test the waters before you take the plunge:
Try holding her hand. Simple, safe and very, very effective. If she lets you, the traffic sign has changed to - hey, hey hold it - not green, but amber.
Start touching her casually - In a conversation, helping her to enter a restaurant etc. If she doesn't move away or look uncomfortable - and who knows, she may even show that she likes it, things are warming up between the two of you.
Set up a situation, like teaching her to play pool or showing her a function on the Windows XP software - where you have to be really physically close to her. Again , watch her reaction and you will get your answer.
Ask. This is drastic, not very subtle and can backfire. But, if you are good friends and very comfortable with each other, and you can ask the question without being crass, crude or offensive ("how about it, babe?" will get you kicked out on your butt!), it may work

you're not ready to make a commitment, she may say no even though she's very attracted to you.
• They're scared. Of your intentions, of the future of the relationship, of being considered "easy", of becoming vulnerable etc.