What do you call a woman who uses the rhythm method?

Here's a thing:  "Some 40 percent of embryos produced naturally do not implant and so never develop into babies."(ref)

 

Thus:

"...the rhythm method may well be responsible for massive embryonic death, and the same logic that turned pro-lifers away from morning after pills, IUDs, and pill usage, should also make them nervous about the rhythm method "

From an article in the Journal of Medical Ethics, via Hit and Run

 

Maybe their math and/or logic is goofy, but its an interesting conclusion to make when you consider the significant number of fertilized eggs that are naturally discarded on a daily basis.

 

Bonus item:

"John Rock was christened in 1890 at the Church of the Immaculate Conception in Marlborough, Massachusetts, and married by Cardinal William O'Connell, of Boston. He had five children and nineteen grandchildren. A crucifix hung above his desk, and nearly every day of his adult life he attended the 7 a.m. Mass at St. Mary's in Brookline. Rock, his friends would say, was in love with his church. He was also one of the inventors of the birth-control pill, and it was his conviction that his faith and his vocation were perfectly compatible."
 

Malcolm Gladwell wrote about him in the New Yorker.