Intrauterine insemination (IUI) is a technique involving the artificial insertion of sperm into the uterus to create a pregnancy. It is a less invasive procedure than IVF, and involves placing the sperm directly into the uterus, bypassing the cervix. This prevents spillage and helps sperm to pass through the cervical mucus. It can be helpful in cases where the male has a low sperm count, or where the sperm are unable to pass through the woman's cervical mucus.
Because sperm is placed directly inside the uterus, IUI can help couples who are unable to have intercourse or who have difficulties such as premature ejaculation. It may also be performed using donor sperm, which may be used in cases where the male partner is not producing any sperm, for single women or for same-sex female couples.