My, my, my, my, my....
Bethie, we have much work to do here.
First of all, you non-flirters are missing out on all the fun. It isn't that hard...just be your natural, friendly, funny self and throw in a few winks and touches for good measure. Compliment members of the opposite sex about anything they do right.
What's this about flirting without serious intent? The whole fun is in trying to figure out whether there is any serious intent! If there's not at least a glimmer of interest, it's not good flirting! You want them to think about you for hours or days afterward.
If you're a woman flirting with a man, don't act stupid. Stupid isn't sexy, except to men who aren't worth flirting with anyway. If you're a man flirting with a woman, you REALLY don't want to act stupid! Women are always attracted to intelligence.
The best flirting makes the other person think you've noticed something singularly attractive in them that everyone else has missed. It leaves them feeling high. Which is, perhaps, the best reason of all for flirting.
Now. Any questions?
--The Goddess