The causes of sterility could be better characterized in 49 so called complex laparoscopies with estimation of sperm ascension and extraction of oocytes following hormonal stimulation. Oocytes could be obtained in sterility operations. They have been fertilized and transferred into the tubes, with the result of 2 pregnancies after 49 such procedures. Up to now there is no late pregnancy after 115 in vitro fertilizations and 53 embryo transfer into the uterus.