A new iPhone application called the PMS Buddy actually lets men keep track of the menstrual cycles of the cranky women in their lives.

The app, which will be available some time next week, allows users to keep an eye on the mood swings, headaches and food cravings that often occur at “that time of the month”.

It claims over 150,000 registered users and around 20,000 have signed up on Facebook.

The idea for the service started as a joke when PMS Buddy founder Jordan Eisenberg and a group of friends were drinking at a bar and talking about relationships.

According to Eisenberg, he heard a man saying how he avoids confrontations by tracking his wife’s menstrual cycle on a daily planner. So they’ve decided to automate it and make it available to the masses.

“There are a lot of people out there that think we’ve been misogynistic, but we tell them it’s a free country and if you don’t like it don’t use the Web site,” he said. “We think it has an altruistic side to it. It helps people,” Eisenberg said.

PMS Buddy is also available for iPod touch but it is not clear how much the app will cost.

(Via CNET)