The Jonas Method
I saw the Jonas method after a quick google search and found his sex selection page here. So far I haven’t found anything on his website about what his method actually is but it seems to be based on hormone measurements and calendar days. They also claim the rhythm method fails. After several years of using NFP and only 2 planned pregnancies (both of which happened the 1st month we tried) I can say NFP works. But you have to go by more than one set of data. If you cross reference temps, cervical cm, and cervical postion you can get a really accurate description on what is going on.
I’ll do some more digging into the Jonas method and see if he’s got anything or not.
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