Heh, or it's cuz you have such lousy days all of us are sympathetic.
I decided a long time ago that I would not be one of those women who come to work and grouch about life, that I would never let people know when I was having "female issues", and that life's just easier when you pretend to be a nice person. But you can't do that 24-hours a day, it's too hard.
That's a good attitude to take. And this is a safe place to do your griping.
I speak from experience. ;-)