Like anything you have to practice it until it becomes naturaly and part of who you are.
http://www.menshealth.com/mhlists/flirting_tips/
Oh and ignore the first guys comments. You're already half way there to being lazy about getting women so don't let his jaded opinion influence you to be anymore negative. No looking for more reasons to be lazy about it by blaming it on men being the one's that "have to do all the work."