Welcome to the Natural Family Planning Association - Ontario. Our association teaches the Billings Ovulation Method of natural family planning. The Billings Ovulation Method teaches a woman to interpret her natural signs of fertility through all her changing life stages from puberty to menopause. It is not the Rhythm method nor the Calendar method. It does not involve temperature taking. The Billings Ovulation Method is easy to learn and is highly successful when used by a couple to achieve or avoid a pregnancy. more... See more text