The Menstrual calender for men
28 Days After, was developed as handy little app/service to help keep the boys on their toes, and in better standing with their wives, girlfriends, moms, sisters or co-workers. A little heads up never hurts!
Simply enter the approximate start date of her last period and receive an alert via email or text message.
This application makes no guarantees, use at your own discretion.