I have long wondered about the many comments I've seen here and at other sites about a man's balls being full of cum. "Bet those balls shoot a big load" or "My balls are so full of cum they ache" or "Balls in need of draining". Do these comments really indicate that guys think cum is produced by the balls? Or is it just an emblematic reference to the testicles' role in masculinity? To be sure, the balls do produce sperm cells and of necessity a little bit of fluid to transport those spermatozoa. But that only accounts for a few percent of the volume of a cum load. Well over 90% of the cum comes from the prostate gland, after being produced there and in the seminal vesicles. So what's with balls being "full of cum"?