IUDs increase phagocytosis of sperms within the uterus and the ions released suppress sperm motility and the fertilising capacity of sperms. Hormone releasing IUDs make the uterus unsuitable for implantation and the cervix hostile to sperms, e.g., progestasert, LNG-20. Intra Uterine Devices (IUDs) are used as one of the effective and popular contraceptive method. These devices are inserted by doctors or expert nurses in the uterus through vagina. IUDs are presently available as the non-mediated IUDs (e.g., Lippes loop), copper releasing IUDs (Cu-T, Cu-7, Multiload 375 ) and the hormone releasing IUDs (Progestasert, LNG20). IUDs do not suppress gametogenesis as gametogenesis (oogenesis) takes place in the ovary, while IUDs are inserted in the uterus (through vagina) with the help of an doctor or an expert personnel.

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