Specimens from 100 fertile or potentially fertile men with sperm counts above 20 million/ml were analyzed objectively by the new multiple exposure photography method (MEP). The following results (means and standard deviations) were obtained: sperm concentration, 66 million/ml +/- 47; percentage of motile spermatozoa, 45% +/- 18; speed of motile spermatozoa, 30.3 micrometer/second +/- 5.5; abnormal forms, 29% +/- 10.2; average motility index (product of sperm speed and fraction of motile spermatozoa), 14 +/- 7.5. Low correlations were found between sperm concentration, percentage of motility, and spermatozoal velocity. Moderate correlations were found between percentage of motility and spermatozoal velocity. Negative moderate correlations were found between abnormal forms and spermatozoal velocity as well as between abnormal forms and percentage of motility. The differences between some of our results and those obtained by others are discussed.