Quoting lil*Mama*Bearô:" <blockquote><b>Quoting A, E & W's mommy:</b>" we use natural family planning for the ... [snip!] ... for us. Once you know what you're doing it can be quite effective."</blockquote> So you have to plan sex basically?"
No, it's just that depending on when in your cycle you're at when you want to have sex dictates how you go about it. For example we know that I tend to ovulate between cycle day 19 and 21 and my cycle is a pretty regular 32-33 days. My luteal phase is 13 days. So because all of those things are consistent I know that starting 6 days before my typical ovulation day we start using pull out method, there aren't likely going to be any sperm that make it to ovulation at that stage but to just reduce the risk we limit the number of little guys that'll even get in there. Then starting 3 days before typical ovulation we start using condoms until 36 hours after confirmed ovulation. After ovulation is confirmed I continue charting to make sure there are no drops in temp (indicating a possible second ovulation coming) and just continue to have sex as normal without any contraceptive until I get my period.