I hope this doesn't sound like a stupid question, but I was wondering how much of the total amount of semen that is currently held in your balls is actually ejaculated every time you come? I guess this can be answered in a medical way or just from your personal experience. Is there ways to make more or less of it come out with any given orgasm. I know there are times when I would like to "save some for later" and there are other times when I would like to let it all cum out. What do you think?