Am I an outrageous flirt?

Do I flirt with my male friends? Where is the line that is not to be crossed? Where is the the harm in a bit of banter? I know that I don't fancy them and would never in a million years consider anything of a romantic/sexual nature. However without sounding conceited, what if I'm unwittingly leading them on?
One of my friends works in a male environment and so naturally socialises with them. She might consider that she is just having a laugh with them until she finds herself in the awkward situation where someone thinks that she is attracted to them and makes advances. I suppose that can't be helped, wires get crossed, signals get misread. The only way to avoid that would be to conduct all business in a large boardroom full of people and only socialise with female company (although these days that would be no guarantee!)
I suppose the line would be crossed if there was a spark of attraction. Now I'm getting into dangerous water! Before I go any further I should point out that husband reads my blog so even if I were having a torrid affair I wouldn't be revealing it on this blog, I have a secret one for that (just kidding darling!)
Even some of the most prominent characters from the Bible faltered on this score. King David got someone else's wife pregnant and sent the husband to the front line of battle so that he would be killed. Wait a minute! We were just talking about sparks of attraction, isn't that a bit extreme? Well that situation started out with a spark of attraction (or lust) when David saw her taking a bath.
What I am saying is; it could happen to anyone, we are only human. It's what we do about it that is important. So what do you do? I would say "run a mile!" Do the exact opposite of what you want to do and avoid that person at all costs. If people like David, who was so close to God, can't resist temptation what chance do the rest of us have?