Barbara Raboy, administrator of the Sperm Bank of Northern California in Oakland, Calif., holds semen vials which are stored in cryogenic tanks, left, containing liquid nitrogen keeping storage temperature at 196 degrees below zero centigrade, Sept. 10, 1985. Four women from Australia were exposed to the AIDS virus through artificial insemination, and American sperm bands have begun conducting new tests and rejecting gay men as donors. (AP Photo)