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the Church allowed the rhythm method is because they couldn't reasonably tell people, "You must have sex tonight because you are in your fertile period." No way to enforce that because husbands may not be "up" to it, or one or the other spouse may be traveling for work, etc. And I'm an old lady, but I remember being told in the early 60s that if a couple intended to practice rhythm, they must obtain permission from their parish priest.