Don't understand what all the fuss is about the volume of your cum. I'd sometimes, with GFs only and only in my younger days, fucked and cummed too many times in a short period of time that in the last couple of times I only managed to squeeze out a tiny drop of "semen". We just both laughed at it. It was a testament to how much my girl turned me on to make me still wanna fuck her even though I had nothing left in the tank.