The main requirements to which they must meet: 1) sufficient efficiency; 2) harmlessness to health; 3) ease of use; 4) preservation of the physiology and psychology of sexual intercourse. Ideal does not exist, however, it is approaching the use of "safe" days of the menstrual cycle and intrauterine contraceptives.
There are various in action: mechanical (making it difficult to connect the sperm with the egg), chemical (having a sperm action); biological (suppressing ovulation), intrauterine (preventing the implantation of a fertilized egg), physiological (method of accounting for "dangerous" and "safe" for conception days of the menstrual cycle.
- Mechanical means
- Physiological method
- Intrauterine contraceptives (Navy)
- Biological or hormonal method
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