When someone with small balls has been masturbating too much they might run low on spunk. And if they have maybe a date with a woman they fancy they will have to stop masturbating and save up there spunk so they can fill the woman up.
Mr X: I heard you have a date with that sexy lady who works on the desk next to yours. What are you planning to do with her?
Mr Y (small balls): Well i have been 'saving-up' just in case something saucy happens. hahaha