Meet PMSBuddy, a free online warning system. Also as a Facebook app. Here’s a little taste:

… with a single goal in mind: to keep you aware of when your wife, girlfriend, mother, sister, daughter, or any other women in your life are closing in on “that time of the month” - when things can get intense for what may seem to be no reason at all.

I reckon there’s gotta be a brand behind this but couldn’t figure it out yet. Then maybe not and it’s ‘just’ a business model punting with the Google ads.