Re: Contraception in marriage
The rhythm method supposedly works. My wife got pregnant in April of 1974. So that was only 5 months after we started having sex. I can't say that was any better than just luck. But having studied the issue, it is true the method should work.
However, my wife was not careful. I discovered she never actually timed her period at all. She just guessed. She didn't care at all if she got pregnant or not.
There are lots of books on the rhythm method of birth control. How to judge your fertile days is the important part. You can actually discover a lot of useful information in books about how to get pregnant, and apply it in reverse, by avoiding unprotected sex the days when you are most likely to conceive, and a few days before and after.
The most important thing to know, as with any birth control method, is you can get pregnant. If you can live with that, it can be fun. I was a bit miffed at my wife when I discovered she had been just making up her information on her periods, but I love my son. He is a great man, and I am very proud of him.