For instance, a demon could not produce semen.

The authorities said it was virtually impossible for boys that young to produce semen.

Bulls continue to offer the quickest path to improvement since a single bull produces enough semen for 25,000 to 100,000 inseminations in a top year.

Older men produce less semen.

Testicular factors refer to conditions where the testes produces semen of poor quality despite adequate hormonal support and include:

Women don't produce semen.