Even as a joke, there's nothing quite as tacky as a menstrual calender designed to be a monthly alert for men who lack a 10th grade understanding of women's health. Lucky for Ah-Ha! The Essential Tool for Men (us: Men Who Are AssHats), it's not the first feminine-cycle tracker in the world of apps, but that doesn't excuse the amount of ignorance and insensitivity it took to conceive, develop, and sell a program this juvenile.
Here's one example of its inanity: forgetful boyfriends or husbands can program reminders for important events like birthdays or anniversaries, as well as store notes on a special someone's favorite restaurants, colors, jewelry, etc. Seems to us that if you can't remember fundamental details of your girlfriend or wife's personality, or your own anniversary, you've got bigger problems than her next period.