Assisted Insemination normally referred to as Intra Uterine Insemination (IUI) is a procedure where a woman’s partner's sperm is placed in her uterus at the time of ovulation. Drug stimulation is not used unless the woman does not have regular menstrual cycles. IUI treatment requires blood tests and scans to predict ovulation and timing of insemination.
An IUI is performed by threading a very thin flexible catheter through the cervix and injecting washed sperm directly into the uterus. The whole process doesn't take very long - it usually only requires the insertion of a speculum and then the catheter, a process that may take a couple of minutes.
Most women consider IUI to be fairly painless -- along the same lines as having a pap smear. There can be some cramping afterward, but often what is felt is ovulation-related rather than from the IUI.