I've heard of PMSbuddy.com before, but, not until it hit home today (a girlfriend of mine emailed me that her boyfriend signed up for it), did I realize the connection. This is the counter site for the guys that belong to the DABA girls (you know those "Banker Girlfriends" that have gotten way too much attention.) PMSBuddy is a free service "created 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."
"For women, this is a great way to give people in your life a heads-up of when you might be feeling a bit irritable without having an awkward conversation."
I don't think we need a website to do this, but these guys insist that you do, and have all of their grounds covered: there's a Facebook app, an iPhone App, and even "National Alert Levels" (right now our nation is at an "Overall Threat Index" is at a safe "One."