My menstrual calendar is simple and pleasant to use.My menstrual calendar is simple and pleasant to use. The calculator only estimates the monthly menstruation cycle, but does it well.Couples who are expecting a child can find the good periods. It is also especially useful for those who want to plan a weekend getaway or a weekend of sports. Finally, it will be useful to men who want to offer an evening to his wife, mistress, concubine or other.