Girls still like to flirt even when they're in relationships! Flirting is a harmless exercise that can excite girls without them technically cheating on their partner.

Conversing with people/girls in general will help you to be flirtatious.
Sometimes flirting can just be fluff talk but your voice, body language and the underlying tone of the conversation may subtly hint at being sexual.

Other times I like to think of it as 'playful teasing'
Part of is learning to calibrate.
Enjoying the process is key.
Having fun talking to women will naturally help you learn

Agreed with most of that.

nrjose - define 'flirty'. Picture a man flirting with a woman. What is it about that interaction that makes you think they're flirting? Chances are, both are smiling, maybe laughing a bit, there is perhaps a sexual undertone to it but not necessarily an overt one, and both are enjoying the interaction.

I actually find that old men (like ones in their 70s, not middle aged) are usually good at this. I suppose they've lived their hard life, are now retired, have achieved what they wanted to, have probably been married and have some decent experience with women over the years. They don't have hang ups like we do, they're not nervous because they know what's important in life and know that if a stuffy girl doesn't join in their conversation it's not going to make any difference to their life whatsoever. They see a girl on a till in a shop or something and just flirt mildly with them - they have no intention (or no expectation) that they will end up fucking her, they just simply do it to enjoy themselves and to give the girl some light hearted entertainment as well.

Taking pick up too seriously is a problem on here. Sometimes, don't worry about the mechanics of a set and all that stuff. Just go and enjoy yourself, have a laugh, be light hearted and most importantly enjoy the interaction.