A sperm bank is a department with assisted reproduction clinics this intended for freezing and storing sperm for later use in fertilization of ovules in assisted reproductive techniques such as in vitro fertilization. It uses a sperm bank when the woman has no partner, when couples have infertility problems by male end factor, or when there is a high risk of transmission of paternal hereditary disease, among other cases. Frozen sperm is also useful in the case of men who are about to undergo chemotherapy or radiotherapy, because these treatments could jeopardize their future fertility. Besides, donor semen anonymously must meet the requirements indicated in the applicable law and subject to some controls to donate the sperm bank. The quality of the frozen samples does not deteriorate over time, but patients are required by law to report periodically to the bank's desire to continue keeping them.