The frequency of spermatozoa bearing one or two fluorescent bodies (FB) has been studied in two series of semen, normal and abnormal (asthenozoospermic). The percentage of spermatozoa with one FB is lower in abnormal semen (41.19% vs 45.82%). On the other hand, there is no significant difference when spermatozoa bearing two FB are compared (1.95% vs 1.90%). Various correlations among semen characteristics were studied, including sperm count, mobility, vitality, percentage of normal forms. Two correlations were found to be significant: positive correlation between the frequency of one FB spermatozoa and mobility and a positive correlation between the frequency of normal forms and the frequency of one FB spermatozoa. The differences between normal and abnormal semen involve only one FB spermatozoa and not those with two FB.