I did not put this in the humour section for a reason. This is absolutely true. This app is an essential tool for any man who is married or is currently involved in a relationship with a woman. Want to know when the best time to mention that expensive wax purchase? Planning a trip with the boys? Iphone users will need this app to keep their relationships happy. Check it out: The Period Tracker App: Update: Period Tracker Deluxe (healthcare & fitness) | App Store iPhone Apps iTouch Applications Wallpapers iPhone News Downloads