How the program works?

The calendar method is the most simple one. You mark the start of your cycle. The program calculates when your ovulaiton will most likely occur. We subtract from the menstrual period the luteal phase. 'Method' to have a boy. Intercourse should take place a day before ovulation, during ovulation day and a day after ovulation (during which the alkaline secretions are highest). The Y chromosome being faster than the X chromosome could reach the egg before an X chromosome and fertise it. 'Method' to have a girl. Intercourse should take place only and exclusively up to two days before ovulation (and that's it! Until a few days after ovulation, this will ensure that the quick Y don't get there first). Sperm last up to 3 days (in rare cases even more), therefore if the X chromosome being more resistant survives until ovulation occurs it has more chances of fertilising the egg. Also during the days before ovulation the secretions are more acid and benefit the X chromosome. Other methods: temperature method and cervical fluid method calculate data in your diary