coatis (pulling out)
rests exclusively on the man: it means that he pulls out (removes his
penis from the vagina of his partner) before ejaculation.
Reliability: absolutely none. There is no guarantee of self-control.
Also, spermatozoids are present in the secretions not counting that
drops of sperm can leak before final ejaculation.
Advantages: the least expensive of all methods, along with total
Ogino-Knaus (rhythm) method
is based on statistics and on the observation of bodily changes.
Statistics: it means observing the length of cycles by carefully noting
the dates of your period, first to verify the perfect regularity of
your cycle (not very common!) and then, to determine the period of fertility
which is said to be approximately 14 days before the beginning of your
next period. You then abstain from all sexual relations at this time,
more or less from the 10the to the 17th day after your period.
Bodily changes: The hormone progesterone secreted after ovulation increases
the body temperature by a few tenths. Taking your body temperature regularly
in the morning upon waking up allows you to notice this temperature
increase and to verify that ovulation has taken place.
Reliability: absolutely none. This method, very fashionable in
the 50's et 60's, largely contributed to today's rampant demography!
Advantages: you only need a pen, a calendar and a thermometer.
Inconveniences: not only is this method inefficient (or very
risky, if you prefer) it is also extremely stressful, inconvenient and