Completely detatched from reality.
Natural family planning (billings) is 99% effective when used properly, matching hormonal pill methods.
No form of contraception is fool proof, of course, because creating babies is what sex does.
When you think about it, its a strange thing to attempt, to interdict your bodies natural processes.
I appreciate the obvious convenience of the pill for women, but billings is useful not only in avoiding pregnancy but in getting pregnant when desired too.
One of the most highly researched methods of family planning that exists today. The method consistently shows success of over 99% in avoiding pregnancy and 65-78% in achieving pregnancy in sub fertile couples. In trials the WHO states it is a very, very effective method of family planning. But it is so much more than this, it is also an excellent tool for monitoring her reproductive health and most definitely “…knowledge of her body that every woman ought to have.” Dr. Evelyn Billings.
https://www.billingsmethodengland.org.uk/
Billings isnt unpopular because its ineffective, but for cultural reasons where a drunk woman might choose to shag some random in an alley outside a nightclub, in between mouthfuls of a bag of chips.
This kind of behaviour is why our society puts so much stock in artificial methods, its not due to necessity.
But, for women who conduct their sex life responsibly, Billings is a perfectly reasonable and effective choice.