Just read this...
Contrary to popular belief, men do not need to masturbate or have sex regularly in order to prevent “blue balls.” Excess of sperm is handled naturally by the body by releasing it into the urine stream.
That is true for sperm and semen (two different things) but masturbation and regular sex is thought, admittedly only anecdotally to be generally health for the organs involved, prostate seminal vesicle etc and is thought to help prevent some ailments. Sperm themselves have a very short lifespan especially within a human body due to the higher temperature, that is why your testicles are outside of your body and if you want a baby wear boxers lol
The last bit isn't a guarantee but it helps.