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Many couples are frustrated by infertility caused by deficiency in semen characteristics, eg oligozoospermia. This pathology has not been consistently corrected by medical therapy, but AIH using the split-ejaculate method has been offered as a reasonable alternative because of its simplicity and potential benefit. The distribution of spermatozoa in the semen of animals and man is not uniform throughout the entire ejaculatory process. A historical review of this phenomenon is shown in Table 1. By fractionating the seminal specimen during the ejaculatory process, one may use the more concentrated, better-quality portion in performing insemination in infertile patients. In man, the first part of the split ejaculate usually contains 76% of the total number of spermatozoa (MacLeod and Hotchkiss 1942). The ejaculatory process involves three events which occur