lUDs are ideal contraceptives for females who want to delay pregnancy and/or space children. Explain?

IUDs (intrauterine device) are inserted by medical experts in the uterus through vagina. They are of various types, such as non-medicated IUDs (e.g., Lippes loop), copper releasing IUDs (Cu T, Multiload 375) and the hormone releasing IUDs (Progestasert, LNG-20). IUDs increase phagocytosis of sperms within the uterus and the Cu ions released suppress sperm motility and the fertilising capacity of sperms. The hormone releasing IUDs, in addition, make the uterus unsuitable for implantation and the cervix hostile to the sperms.