Freezing whatever its purpose creates in temporarily in the genesis of life. It can contribute to an accumulation of embryos. For the time being such a technique remains largely experimental and is not completely under control. As a consequence of its experimental nature, freezing must follow the above recommendations and be done in certified centers offering required scientific and technical guarantees. Although it raises oppositions in principle, freezing can be justified as a means of achieving the parenteral couple’s effective procreative objective at time. It can be accepted as far as it permits the transfer of embryo in women at some point during a future cycle, or later transfers in case of failure, again to collect and fertilize Oocytes. Also, it avoids having to destroy embryos which can not be transferred immediately.