Abstract
The ability to preserve human sperm by cryogenic methods was developed and successfully applied to reproductive biology. Some of the advantages include availability of sperm for heterologous (donor) insemination; accumulation of multiple oligospermic specimens for homologous (husband) insemination; preservation of sperm prior to vasectomy; collection and preservation of sperm from men who face permanent injury to spermatogenesis through an operation, chemotherapy or radiation; to obviate the potential genetic danger of man''s exposure to environmental pollutants such as radiation and availability of husband''s sperm at ovulation time.