Never had an issue with a woman not able to handle my cum. In my younger days I could cum six to eight time with the right woman. The first two obviously being the biggest. And those would either end up in their pussy or ass the majority of times. But never had a woman who did not find excellent use for all the cum she was able to get out of me. And some women knows how to empty a man and will swallow four, five guys one after the next. Been in that line too. Now that I am older. If I give up four loads, then that woman has got to be very special and deserving. And, there is no way I can see why any woman would not want to take everything she gets from her man body.
So, no. There is no such thing as too much cum.