You know all those times you've dismissed the insults a girl's hurled at you because 'she's on her period', and you have to be understanding?
Yeah well, here's something: when she's got her period is the *only* time she tells the whole truth about what she thinks. It's giving her the courage and recklessness to be honest.
It's the *rest* of the time she's not 'being herself' - to save your feelings.
Have a nice day! :o)