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Prostrate
The prostrate is a gland in boys where semen is created and stored (but not sperm). It is about the size of a walnut in adults. It is located below the bladder and surrounds the urethra?.
I have read that when the prostrate is full a man?'s whole body knows it. I'm sure this is because reproduction is our genes?' number one job.
It seems to take about 3 days for a prostrate to refill after an ejaculation. I think it's also possible for it to empty out.