Can a man increase the amount of semen that he produces ?

Not above normal: This is not usually possible. Abstinency will increase the volume somewhat at the next episode. Frequent ejaculations may reduce the volume.

Semen Volume: The semen volume is not the important issue for fertility, the sperm number and quality are the important factors. Of these two factors, i consider quality the most important. We can easily measure number, movement and shape of sperm. Quality or fertilizing potential is not a single measurement. See http://bit.Ly/ydhbbd. I use the sa to estimate the ability of the sperm to fertilize the egg.

Not really: There is no good way to increase the volume of semen, but there really is not much need to increase the amount. While the volume may seem small, it is usually enough. It is the count that is crucial.