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Sperm levels and frequent ejaculation

At least three semen samples should be recommended to estimate an individual's semen profile.

Sperm levels and frequent ejaculation

The more a man ejaculates each week, the lower his sperm levels fall, according to recent research. However, this ejaculatory frequency only partly explains why a man's sperm count varies widely each time it's checked. Researchers from Rigshospitalet in Copenhagen, Germany, studied 27 healthy men who provided monthly semen samples and responded to questionnaires regarding ejaculatory frequency, duration of abstinence, and episodes of fever. The subjects were followed for 16 months. No seasonal variations in sperm levels, movement, or shape were seen. However, ejaculation frequency was found to be higher in spring months than in the winter months. As noted, sperm levels fell as weekly ejaculatory frequency increased. Compared with one ejaculation, sperm levels fell 29 percent with two ejaculations and by 41 percent with three ejaculations. In contrast, ejaculatory frequency seemed to have no effect on sperm movement or shape. The sperm characteristics noted in one sample often differed greatly from those observed in a subsequent sample from the same subject. This wide variation dropped markedly when three semen samples were used instead of two. Ejaculation frequency, duration of abstinence, and a fever episode contributed to this variation. The majority of the above variations remained unexplained. The findings suggest that at least three semen samples should be recommended to estimate an individual's semen profile.
Fertility and Sterility,
August 2004
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