Studies of human seminal parameters with frequent ejaculation. I. Clinical characteristics

The intra-subject variation in seminal parameters (e.g. volume; spermatozoal density, motility and normal morphology, and total spermatozoal count) have been examined in 172 men following a set ejaculatory pattern designed to exhaust their extra-gonadal spermatozoal reserve. The results have demonstrated that the motility and normal morphology of spermatozoa do not change significantly with ejaculation frequency. Also, while the volume of the ejaculate and the total number of spermatozoa decreased during a period of frequent coitus, an individual's depletion and recovery of his spermatozoal reserve could not be accurately predicted. It is suggested that coital frequency during the woman's periovulatory period could be modified by the partner's response to this test. Furthermore, while it is acknowledged that the variation in results from a 'routine' semen analysis is large, data obtained after depletion of the extra-gonadal reserve and recovery over a set time may have more value and could be the method of choice for the future.