At eighty years old, a woman who menstruated for forty years will have experienced 480 days of fertility. At eighty years old, a man who hit puberty at age twelve will have experienced 24,208 days of fertility. So let’s do the math. 24,208 divided by 480 . . . carry the 4 . . . and it turns out that compared to women, men have a little more than fifty times the number of fertile days.
