>>3138317No the amont of sperm does not build up but it would feel better.
When you have sex, laugh, etc. your body releases endorphins that then go to your brain and makes you feel good. If your brain experiences this often the you'll become more numb to it.
But if you don't nut for awhile, which does release alot of endorphins, you'll be more sensetive to it, making for a better nut.