This is all true but unfortunately in our society we seem to have decided that no one could possibly be responsible enough to follow such a self-monitored schedule and instead the responsible thing to do is just tell people it doesn't work.
Like our gov and the WHO telling us not to wear masks recently.
Most women in my experience are pretty regular and you can trivially avoid having sex for an exta few days out of the month. Coupled with "external finishes" i have a feeling this is actually a valid method of birth control for responsible couples.
Like our gov and the WHO telling us not to wear masks recently.
Most women in my experience are pretty regular and you can trivially avoid having sex for an exta few days out of the month. Coupled with "external finishes" i have a feeling this is actually a valid method of birth control for responsible couples.