Intrauterine Insemination (IUI), consists of placing a sperm sample, previously prepared in the laboratory, inside the maternal uterus in order to increase the fertilization potential of the spermatozoa. With this procedure it is possible to synchronize the best moment for the meeting of the male gametes with the ovule. In this way, we try to reduce the distance that separates the egg and the spermatozoon so that the couple gets pregnant.