This is a novel procedure which involves the collection of semen (sperm) in a laboratory followed by washing and cleaning of sperms. The dead and immotile sperms along with the debris are removed from the sample. The remaining best quality sperms are aseptically injected into the intrauterine cavity using a special cannula in the operation theatre. The procedure of IUI is preceded by controlled ovarian stimulation or superovulation (This procedure involves stimulation of the ovaries to produce several follicles in contrast to COS where only one or 2 follicles are stimulated). In normal cases the success rates of IUI are 10 to 15% in each cycle. Hence several cycles of IUI may be required for optimum results.