My Calendar is android application that helps calculate your monthly circle, and also indicate your safe days, this has help my family on child spacing/ family Planning i think every family should have it and practice it , if the spouse understand each other i think it will work for them. there are other apps but this one is very easy and the prediction 99 % correct. i have it in my phone as well as my wife so before i decide to have sex with my wife i had to just check up my phone to know if she is safe lol. no condom no pills