What makes a femme fatale?

It may NOT be what you think.
 

I've been thinking about writing an article about this for a long time now (you wouldn't believe the silliness I hear coming from women's mouths, regarding parameters of "attractiveness" in women!), but I found the most extraordinary article today:

What makes a femme fatale?
(and what a femme fatale is NOT)

It is relatively short, but condensed there is real knowledge about the subject. And lucidity - one of the things that I admire the most... especially in a woman.