Psychological studies show that casual touching during a friendly conversation causes people to remember the conversation more fondly after the fact.
It's quite simple - hug them, touch their hand sporadically and in A NON THREATENING WAY. So the idea is, you hide completely the interest you might have AND at the same time you act really touchy/huggish.
The problem is - you have to start this early in the "friend" relationship, it has to seem natural, or otherwise she'll wonder "what is he doing lately?".
Once you've developed that kind of flirtatious friendship, it's easy to spawn other such 'friendships' with other women: they will see you being close to another woman, and I think the key here is that, it probably does not trigger as much jealousy as it makes them feel comfortable -- they see another woman being touched by you in a non-threatening way, and, blam, social-proof, it becomes a 'proof' to them that it's normal for you to touch them in turn...
Start casual touching as soon as you meet the person. Meeting someone for the first time is an excellent chance for starting casual touching - shaking hands when exchanging names is a tradition of many cultures and cultures. But make sure you hold on to her hand longer than expected, long enough for you to enjoy it and her to notice, if not you enjoying it but at least you not letting go as quickly as people usually do.
Pay attention to how she responds to you. If you do this you will be able to better gauge if you have the appropriate rapport to invite a kiss. If her body seems to respond to the non-sexual touching then get gradually more sexual. For women some areas of the body outside of the primary erogenous zones are intimate: Palms, inside the elbow, ear lobes, cheeks, the hips were the waist meets the hips, between the fingers....
Do the things that lovers do - brush off "something" that's stuck in her hair, gently stroke her cheek pretending to wipe off an eyelash etc. These are the types of things lovers do and by doing them, you will make her feel (doesn't even matter if only subconsciously) like you were her lover.
When meeting girls you already know, shaking hands might seem strange, so giving some sort of a hug is the way to go. You don't need to fall all over her to give her a hug (which depending on the situation might even make you look like a fool or a pervert or make her embarrassed instead of having her enjoy it too), a hug can also be putting your arm around her waist or shoulders when standing to her left or right and pulling her closer for a moment, or taking her hand for a moment (but not shaking it), or her elbow, or arm etc.
Set the mood of the date from the start. When going on a date/get-together, establish the mood immediately. You can of course change the mood from "polite and calm" to "warm and friendly" to "aroused and sweaty" during the course of the meeting, but why go the hard way, if you can jump right into "warm and friendly" or beyond in the first place.
"Can't hear you." Try this: If she says something, lean forward as if you aren't hearing her very well, and touch her (arm or back). Then lean back again and answer.
Talk To The Opposite Sex Everywhere