Yes: You need to have regular, predictable, consistent cycles. If you do, you can calculate when you ovulate and avoid intercourse starting a few days before ovulation to a few days after.
Answered 9/28/2016
6.4k views
No: If when you say safe you mean 99-100%: in theory 'yes, ' in practice a big 'no.' this is called the 'rhythm method' and has a failure rate of around 30% at best, often much worse.
Answered 7/20/2012
5.9k views
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