As age increases the chances for a woman to become pregnant decrease as well spontaneously as through assisted reproductive technologies (ART). For the treatment of unexplained infertilities two techniques can be used: intra-uterine insemination (IUI) and in vitro fertilization (IVF). The aim of the present study is to compare the efficiency in term of delivery rate of IUI and IVF in couples in whom the female age is over 37 years.