Intrauterine insemination is a fertility treatment that’s minimally invasive and less costly than in vitro fertilization (IVF). It’s used for several key reasons. In particular, it’s used in cases of sluggish, or slow moving sperm, donor sperm, and unexplained infertility, according to the American Pregnancy Association. Additionally, Resolve, The National Infertility Association noted that IUI is ideal for women who find sex painful or undesirable, but still want to have a live birth.