> You do realize that the "symptothermal method" is simply "don't have sex during the part of the menstrual cycle that results in babies"?

Yep. Did you read the post?

> Apps exist to track the menstrual cycle already.

Of course. But they don't actually implement algorithms to automatically determine the fertile window (what we're doing).

> Plus using hormones to modify the menstrual cycle has other known positive side effects (such as, avoiding a week or more of severe cramping in some women).

But do these benefits outweigh the costs of increased rates of cancer, blood clots, and stroke? Clearly there are pros and cons—and individual women should make the choices best for themselves—but science shows NOT using hormones to be emphatically safer.