Problems with the sperm themselves are the most common cause of male infertility, although there may also be anatomical problems that affect a man’s ability to ejaculate. The study of male fertility is relatively new compared with female fertility, but doctors now know much more about it and about the role of sperm in particular.

Problems with Sperm
Sperm are extremely vulnerable cells. They take seven weeks to form and can be affected by outside influences at any point in their development. Because of this, it’s entirely possible for a man to give sperm samples on separate occasions that differ widely both in quality and quantity.

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