From a clinical perspective, the results suggest that optimizing the timing of ejaculation could improve reproductive ...

Male fertility rates have been plummeting over the past half-century. An analysis from 1992 noted a steady decrease in sperm counts and quality since the 1940s. A more recent study found that male ...

Hyperspermia means producing more than 6.3 milliliters of semen per ejaculation. That's about 1 1/4 teaspoons. This condition might affect fertility by diluting sperm concentration. Hormonal ...

A woman's fertility normally decreases by her late 30s with reproductive function eventually ceasing at menopause. It is known that a small molecule called nicotinamide adenine dinucleotide (NAD+) ...

NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Research Council, whose members are drawn from the councils of the National Academy of ...