You mean so used that you can't get pregnant? No that is not possible.
sperm
sperm is made in the testicles, then it is stored in the tubules (the tubes that go from ur testes to the urethra) and then they get mixed with all the ingredients that make semen so that the sperm have something to swim through... wherever the semen is is where the sperm are... simple as that however, when sperm AREN'T used, they are disolved by the body and recycled into proteins so TECHNICALLY sperm are everywhere in our body... or at least the chemicals that make up sperm or wat USED to be sperm
The body evolved for sexual activity. It is necessary to have sex to continue the species. Sperm and semen are used in that process, and the male body produces millions of sperm, most of which are disposed of if they reach maturity without being used. It will not weaken your body to "lose" semen or sperm. It is there to be used.
A sperm cell is used to fertilize an egg from a female. The combination of the sperm and the egg produces a fertilized egg which will become a new individual.
Ejaculation.
Meiosis is used to make gametes in the human body. The gametes will either be sperm or eggs depending on the gender.
Nitrogen is used in the males reproductive organs, the sperm to be presise.
Feces.
well if your talking about when you get old then im not as sure ,but its probably because you aren't producing as much actual sperm, just the carrying fluid. Over masturbation can course it as well, as your body has used up the reserve in your body, as such it can no longer continue to produce cum with a normal concentration of sperm.
yes it is possible but not likely and the chances are very low
It is also used in formulas that control body fluids and treat excessive sweating, urine leakage, sperm leakage (spermatorrhea), and heavy, prolonged menstruation.
The sensible answer would be yes. A certain amount of protein is used to make a certain amount of sperm. The more sperm used, the more protein needed. They're directly proportional. Make sense?