Fertility Awareness or Symptothermal Method

Does anyone on Glow use any of the Fertility Awareness Methods of birth control (for example, the Calendar or Standard Days Methods)? Does anyone use the Symptothermal method? My SO and I of several years are not TTC, but also would not be devastated if it happened (it would be unplanned but not unwanted!) and I am looking into natural, non-hormonal, ways/forms of birth control.

Do you use any of these methods?

If so, which one and how has it worked for you?