breezeless night on third full moon = 2% chance (science checks out)

How Come Sex Ed Never Mentioned Getting Pregnant Could Be Hard? So many women are navigating the harrowing transition from “if you let a man within 3 feet of you, you will get pregnant” to “on a breezeless night on the third full moon, you have a 2 percent chance of conceiving.” Why does society keep us in the dark about our own bodies for so long?