If ovarian stimulation with targeted intercourse has not worked, and there is room for other simpler attempts because the couple is young, no worrying infertility factors have been identified and the partners prefer to carry out simpler and less invasive treatments, we can proceed with intrauterine insemination (IUI), which is part of the level I techniques. It is a simple, repeatable, outpatient treatment, in which the woman's ovaries are stimulated with light dosages, as in the case of targeted intercourse, the ovarian response is monitored and, if not excessive, the follicular burst is induced and the liquid is deposited seminal, treated and concentrated in the laboratory, on the uterine fundus, then brought closer to the tubal tract where it meets the oocyte. In level II techniques, however, the spermatozoa and oocytes are brought together outside the woman's body, in the laboratory (IN VITRO FERTILIZATION, precisely, IVF and ICSI), and then the embryo that forms is transferred to the uterus. With in vitro techniques it is also possible to carry out further more targeted studies on the embryo, to obtain information on any genetic diseases affecting the partners, or linked to maternal age, and to exclude the implantation of embryos with genetic pathologies or chromosomal; these diagnostic procedures include PREIMPLANTATION GENETIC DIAGNOSIS (PGT-M or PGT-A).