It is simply a process of preserving sperm cells. Sperm can be successfully used after cryopreservation. The longest recorded time of successfully preserving sperm in storage was 21 years. Sperm freezing can be used in artificial insemination and other fertility treatments or it also can be donated. Donor has to be screened for infections and after 6 months his sperm may be used in treatment. Clinics and banks are successfully freezing and thawing sperm which is later used in treatments for over 40 years now. Unfortunately not all sperm is able to survive the freezing process. It is a very popular procedure among young males which are in need of money – which is significantly lower than in egg donation.