Like other forms of contraception, the thermal method does not offer an absolute guarantee of efficacy. However, research carried out by Dr. Mieusset at the Toulouse hospital since the 1980s has demonstrated that this technique is highly effective, particularly when applied correctly. The results of individual spermograms show that the lower the sperm production, the higher the probability of contraceptive success. During the trials, only one unplanned pregnancy was reported, resulting from incorrect application of the method. The Pearl index observed for this method is around 0.5%, putting it on a par with the reliability of a commonly used contraceptive such as the IUD.
To enhance the reliability of this contraceptive approach, you can combine it with other methods. For example, couples looking for the most natural contraceptive option possible have often complemented the thermal method with symptothermia.
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