To really understand how your everyday life can affect your sperm, you should understand how healthy sperm is made in the first place. A healthy man produces approximately million viable sperm cells each day, although only a tiny few of those will ever go on to try fertilizing an egg. Unlike a woman who will have around mature eggs throughout a lifetime, which can be released from the follicles in the ovaries and potentially be fertilized, a healthy man will produce billions of sperm in his entire lifetime. All the sperm production and maturation take place in the lumen of the seminiferous tubules of the testis as shown in figure 1. Within the walls of these tubules the sperm cells are produced and matures.