The basic requirements that they must meet are: 1) sufficient efficiency; 2) harmless to health; 3) ease of use; 4) the preservation of the physiology and psychology of sexual intercourse. The ideal does not exist, however, the use of “safe” days of the menstrual cycle and intrauterine contraceptives approaches it.
There are various effects: mechanical (which make it difficult for the sperm to join the egg), chemical (with spermatocidal action); biological (suppressing ovulation), intrauterine (preventing implantation of a fertilized egg), physiological (method of accounting for "dangerous" and "safe" for conceiving the days of the menstrual cycle.
- Mechanical means
- Physiological method
- Intrauterine contraceptives (navy)
- Biological or hormonal method
Infectious diseases for all
Diseases of the ear, nose and throat
Modern research methods