Boyfriends and husbands, listen up: Red Flag is a handy little Windows program that warns you when it’s time to buy extra chocolate, speak softly, and watch out for the big stick.

“This little program just needs the date of the first day of blood flow and the usual number of days in the cycle, and it does the rest. Once running, it puts a little flag icon in the system tray (the bit by the clock). When PMT week approaches, it changes from a green flag, to a yellow flag. And when red flag week hits, you guessed it, it goes red.”