I’m a midwife, and I highly recommend the Billings Ovulation Method (BOM) to my clients who don’t wish to use artificial birth control. There is no temperature-taking, as it’s based solely on tracking certical mucus changes. Any woman can simply feel these–and many do so without realizing it, and it isn’t necessary to see anything to do this. The check takes maybe 30 to 60 seconds, less when you’re used to tracking. My wife and I have use this method successfully to both postpone and achieve pregnancy. I would, however, suggest also adding certical position and firmness/softness to the chart. The more signs you track, the better your calculations will be. However, these checks can also be done without sight, and probably more easily without it!, and take only seconds. Cervical position, etc, are not included in the original Billings method, but as I said, are valuable nonetheless. Unlike temping, these checks can be done at any time of day.
There is an excellent book on the Billings method that I recommend to clients; it can be bought very inexpensively. It’s called The billings Method: Controlling Fertility Without Drugs or Devices by Evelyn Billings and Ann Westmore. Here is the Amazon link:
I hope this helps; best to you both!