Cryobanking of human sperm.

The primary use of frozen semen has been for the treatment of male infertility, in which case a 'donor's' semen may be used for insemination independently of time and place. An increase in demand for semen by infertile couples, who represent about 30 per cent of all marriages in the United States, was a contributing factor to the rapid growth of commercial semen banking. Another factor was the increasing popularity of vasectomy