How much sperm cells can a man produce in a day?

According to WHO Norms and Standards an ejaculation should contain at least 39 million sperm cells. In order to achieve this concentration, a man has to remain abstinent for three to five days. With this information I can determine that a man produces about a ballpoint pen ball-sized amount of pure sperm cells per day. read more

As a matter of fact, men produce about 1500 sperm cells every second and will produce more than 500 billion sperm cells in a lifetime. read more

For instance, if germline stem cells stay stem cells for a long time and don't change into sperm cells, a man may be at risk of getting testicular cancer. But if germline stem cells too often develop into sperm, a man may become infertile. read more