Youre absolutely right of course which is why youre being downvoted. My wife and i are catholic and use natural family planning. We started with paper charts.

Youre absolutely right of course which is why youre being downvoted. My wife and i are catholic and use natural family planning. We started with paper charts. NFP was mainly studied by the church and all these apps now are built mainly through research from catholic doctors. In our nfp group, we have many couples. Most of us started charting on paper, and some havs switched to our nonprofits paid app, but nevertheless, speaking with the other husbands there, most of us know exactly when our wives are ovulating based on our perceived changes in their personality. Through many years of paper charts we noticed my wife wouldnt sleep the night of ovulation and would be cranky the next day. Other guys noticed their own things with their wives Its not popular to say, but its true. Women who are actually having real cycles (as opposed to those suppressing it with the pill) do often have personality changes. That does not mean women are overly emotional or not rational it just means they are subject to regular hormonal fluctuations. Men are too of course but as far as i know there are no easily observable metrics to track