all this talk about the chemical components of sperm, nutrients, production rate, attractiveness, etc does have its place in explaining why a man should conserve his "load"; however, it's the ENERGETIC aspect of the issue that is the most important. Since the energy flowing in our bodies (chi in oriental culture) is invisible and ephemeral, it cannot be properly interpreted or measure by science, but through training one can learn to feel it, and in doing so he will understand how it works. Jing (semen) gets transformed into Chi.