As the article suggests, time and again ideology-based policies end up matter-of-factly inferior in their intended effects to evidenced-based practices. The imposition of the former is just that, an imposition. It’s an exercise of power, aimed to control others’ most intimate of lived behaviors and experience. And to insist on effecting such control in a culture that ostensibly champions individual “freedom” is a blatant hypocrisy, and something typically characterized by a self-righteous disregard both for others’ values and for empiric facts.
And regarding a “fertility awareness” approach: I had a friend who employed daily tracking of basal body temp to graph out her monthly ovulation. And it worked well — up until the month she double-ovulated.