I don't claim to be an professional, not in the least, but here are a couple of things i've discovered. I won't go into the business of flirting and talking to women/the opposite sex as that is better to hear in a different article.
1. Don't fidget. Always keep a calm, relaxed body posture and try to look at ease - as if you are completely above the chaos and buzzing activity going on around you (assuming you are in a cafe, club, bar, whatever). An excellent pose to adopt when sitting is back upright, left or right arm extended sideways along the top of the seat (works only if it's a long seat such as those in bars, clubs, or a sofa/couch) and leg crossed on top of your knee. By this I mean having one leg lifted up, rotated ninety-degrees and your ankle resting over your knee. If you're sitting with friends keep your head level and lean back a bit. This way you appear very relaxed and gentlemen like - girls will take notice quite often because it is quite a subtely provacative pose.
Also, if you have your arm extended over a spare spot on the seat, you are almost inviting a chick to join you - a girl on her own or a small group of girls might think "hell, lets go sit with that guy just so we can get to sit down somewhere". Sound familiar? I bet anyone who has been to a night club or bar has contemplated joining someone somewhere just so they can sit down and have a rest from dancing and constant movement. This works best if you are with a few friends. If your friends quickly pop up to the bar to get a drink, bingo, you are left unattended and in prime position to be chatted up by a girl - and believe me, they are likely to have noticed you if they are, uhh, on the prowl.
2. Make eye contact. When walking through a crowd, going to the bar to get a drink or even going to the bathroom, make eye contact for a moment with every girl you pass that looks toward you. Just for a second. Try to get a little smile in there as well. This hints you're interested without really saying much else. The little smile will catch her focus for that split second and she will have a much easier time remembering your face for later. No smile = just another guy. Especially make decent eye contact when moving someone out of your way. If a girl be standing in your way to get somewhere, lightly move her out of the way with a gentle hand and say something like "excuse me my dear" or "excusez-moi" (said excuse-say mwah, it's french); if she turns around then take the oppurtunity to make a brief moment of eye contact and say thank you. Most people don't say thank you after someone has actually moved for them so this often will catch her attention and strike her, plus it makes you look polite and gentlemen like yet again.
3. Fix your attire. This might sound like it has nothing to do with body language, but you have to realise our bodies are encased in our clothing and the majority of what anyone sees is our clothing exterior. So? Fix it! Be proud of what you wear. Buy a few nice shirts if you have the money, dress smarter (don't don dress pants and long sleeve shirts if it's 30 degrees celsius, lets be sensible here). If you're going out on the town and don't plan burning feet on the dance floor, wear some nice dress pants, comfortable shoes to match and a nice long/short sleeved shirt. You will feel more professional shall we say and to the people around you probably seem more cultured, mature and in most cases more attractive. Not to mention women are more likely to ask a guy to buy them a drink when he looks like he can afford it. You probably don't look like you're out just to score and that's definitely a good thing regardless of whether it is your goal or not.
4. Practice. Practice using your body language to assert yourself in the workplace, amongst friends, wherever and take note of anyones changed behaviour. Then go out and use your body language wherever it is of advantage to you and enjoy the results!
For extra on how you can use your body language for the objective of attraction, take a look at http://www.bodylanguage-attraction.com. Have fun!
This article is free for republishing
Source: http://petramoike.articlealley.com/ideas-for-effective-body-language-when-out-on-the-town-in-the-dating-scene-and-just-in-general-2070106.html