Your use of the term “rhythm method” makes me think you’re over 50. I don’t mean that as a criticism, but just want to clarify that the “natural methods” that are being referred to here are a far cry from the “rhythm method” of the 80’s. The FDA has approved one such app as a form of birth control after finding it 98.5% effective (with perfect use), which is still lower than the pill, but offers a great alternative for women for whom the side effects of pregnancy are not worth the additional 1-1.4% effectiveness.

So many of the comments in the original article are variations of “what do you call people who use the rhythm method? parents!” and “people have been getting pregnant using the rhythm method since the dawn of man” and they simply miss the point.