Behaving French

Today I find it suitable
to practice my inscrutable.
It’s part of my act femme fatale
that men can’t fathom me at all.

They’re wiles my mother taught to me
back when I was only three,
and I admit it’s served me well
putting bon vivants through hell.

When situations new astound me,
I wrap my femme fatale around me.
I use it everywhere I go,
’cause it’s the only French I know!

The prompt today is inscrutable.